The Kraken's Toll
One-Shot · 6 Players · Level 10 · ~3.5 Hours · Greek Mythology
📜 Session Summary
| Win Condition Survive the harpy assault, navigate the Siren's Shoals, and escape the Kraken's grasp with the trireme and the amphora intact |
| Setting Open Aegean → trireme deck under harpy assault (Day 2) → jagged Siren's Shoals at dusk (Day 3) → black open sea under a tentacled siege (Night 3) |
| Atmosphere Mythic nautical dread — the sea is not hostile, it is indifferent, and there is a vast difference; the party is not hunted, it is tested |
| Materials Salt-soaked pine deck, iron-bound cargo hatch, wax ear-plugs, bronze medallion warm from a blind man's hand, black ocean water, ink-dark sky without stars |
| Tone Escalating mythic pressure — three days that feel like a lifetime; every encounter asks whether the party trusts the old man's cryptic gift |
| Players 6 × Level 10 |
| Est. Duration ~3.5 hours |
| Encounters 3 — Enc 1: Combat (Hard) · Enc 2: Social/Skill, fully avoidable · Enc 3: Escape Combat (Deadly) |
| Key Maguffin Seal of the Deep (given at session start) · Aello's Storm-Gold Feather (Enc 1 reward, payoff in Enc 2) |
Description
Kallinikos is a blind man who has been waiting for thirty years. He has had time to be very precise about what he wants from you. The job is simple: take a sealed clay amphora three days east-northeast to the Temple of Poseidon on the Isle of Threnoi. Do not open it. Do not anchor near the rocks that sing. Give it to the high priest, speak your names, and leave before nightfall on the second day. He pays well, and presses a bronze medallion into the party's hands before they board.
The sea does not yield its prizes without a toll. Something vast beneath the waves has been watching since the ship left port. The medallion is not a gift — it is a debt instrument, and the party is the courier of a thirty-year-old promise that was never fully paid. Kallinikos knew the Kraken would come. He said nothing because he needed the delivery made. He is ashamed of this. He is also right.
The Seal has two uses — invoke (withdraw one tentacle) and sacrifice (end the Kraken encounter entirely). Players who understand both options will make a genuine choice. Distribute knowledge across acts:
Act 1 (Enc 1 — port / departure): Kallinikos gives the Seal and explains Invoke. He does not explain Sacrifice — he doesn't want to explain what Sacrifice means before they've earned the right to make that choice. DC 12 Insight on Theron: he is nervous around the Seal and won't say why.
Act 2 (Enc 2 — Siren's Shoals): Showing the Seal to the Sirens opens parley automatically. Aello's feather (from Enc 1) also works. If parley succeeds, a Siren whispers: "The thing the old man gave you is not yours to keep. When the sea itself rises — debts repaid in kind make calm the deepest waters." This is the Sacrifice hint. Players who passed peacefully hear it; those who fought miss it.
Act 3 (Enc 3 — open sea): Invoke works once to withdraw one tentacle immediately. If the Maw surfaces (round 5 or 4+ tentacles severed), Sacrifice ends the encounter instantly — all tentacles retract, Maw submerges, Sahuagin dive back in, silence falls.
Key NPCs
Kallinikos — Blind Sea Oracle & Questgiver
Ancient man in his mid-70s. White beard braided with sea-glass beads, clouded white eyes, moves by touch and smell along the docks he has tended for four decades. Always smells of brine and old cedar. Measured and never raises his voice. Uses nautical metaphors for everything. Deflects direct questions with philosophical tangents.
Secret: He bargained with a Nereid thirty years ago to calm a storm that still killed half his crew. The sealed amphora carries his handwritten oath of penance, composed over three decades. The Kraken is Poseidon's instrument sent to test the delivery — not destroy it. Kallinikos knows this. He knew the Kraken would come before the party left port. He said nothing because he feared they would refuse. He is ashamed of this. If the party returns safe, he does not defend himself.
DC 12 Insight: He is not telling the party something important about what they are carrying. DC 15 Persuasion / DC 13 Intimidation: He admits the voyage "has a cost beyond coin." DC 17 Investigation (his sealed letter of commission): A Nereid's watermark — the seal of an old ocean covenant.
Captain Theron — Trireme Captain
Gruff, practical, fiercely proud of his ship. Won't spend sailors on someone else's gamble — but once committed, unshakeable. Respects competence above titles. Privately terrified of deep-ocean nights; he has had bad dreams since leaving port.
Secret: He has sailed past the Siren's Shoals twice before. Once he stuffed his ears with pitch — but once he listened for two full seconds before catching himself. He has never told anyone. He recognizes the Sirens' singing style and avoids eye contact when they come up in conversation. He studies the Seal nervously when he thinks no one is watching.
Combat Role (Enc 1): Helper NPC — fights on deck, grants +4 to one Water Vehicles or Athletics check per round (Enc 3) while at the steering oar. Reduced to +2 if 4+ crew were lost in Enc 1 (demoralized).
DC 12 Insight (watching him with the Seal): He is frightened of what it represents, not of the sea monsters. DC 13 Insight (mentioning the Shoals): He hesitates before answering — there is something he is not saying.
Session Rewards
Keepable prizes earned by completing (or excelling at) this session. One character claims each reward unless noted. Full cards are under Reward Cards.
| Reward | Description | Criteria |
|---|---|---|
| Seal of the Deep | Poseidon's courier seal that forces one deep tentacle or wave-beast to withdraw. | Survive the crossing while keeping the Seal (invoke it, but do not sacrifice it to end the Maw fight). |
| Aello's Storm-Gold Feather | Storm-gold feather that warns of deep tether and softens siren tempers. | Take Aello's golden feather from the harpy assault (especially if the Seal is later sacrificed). |
Creature / Enemy List
| Creature | Easy | Medium | Hard | Notes |
|---|---|---|---|---|
| Harpy | 2 | 4 | 6 | Enc 1 — swarm deck, lure crew overboard |
| Aello, Storm Harpy Queen | — | 1 | 1 (buffed) | Enc 1 boss; flees below 25 HP |
| Siren of the Shoals | 2 | 3 | 3 | Enc 2 — fully avoidable; combat triggered only by party |
| Sea Hag | — | — | 1 | Enc 2 combat only (Hard variant); emerges if fighting starts |
| Kraken Tentacle | 3 | 4–5 | 6 | Enc 3 escape goal; each active tentacle = +1 Grip Counter |
| The Kraken's Maw | — | Optional (Rnd 5) | Yes | Enc 3 — unkillable; use for drama; Seal payoff target |
| Sahuagin Raider | — | 2+2 | 4+4 | Enc 3 — boards ship on rounds 2 and 4 |
Major Beats
- Port of Departure — Kallinikos at the docks: The old man is already there when the party arrives, as if he knew the exact time. He hands over the sealed amphora and the Seal of the Deep with unhurried precision — like a man settling a long account rather than making a business arrangement. He is cryptically certain the party will need the Seal. He does not explain why. DC 12 Insight: He is not lying; he is simply not saying everything he knows.
- Day 1 at Sea — Introductions: Clear weather, smooth sailing. Captain Theron and his six-man crew are introduced. A PC who observes the captain carefully (DC 12 Insight) notices him studying the Seal when he thinks no one is watching — not with reverence, but with the controlled fear of a man who knows what the object has already cost someone.
- Day 2, Midmorning — Encounter 1 (Harpy Storm): Storm clouds spiral down from a clear sky without warning. Aello, the Storm Harpy Queen, has tracked the ship since port — her goal is the sealed amphora in the hold, not the crew. If the party doesn't know the cargo matters, they learn it here. Each sailor lost increases rowing DCs in Enc 3 by 1.
- Day 3, Dusk — Encounter 2 (Siren's Shoals): A jagged cluster of black rocks rises from the amber sea ahead. The helmsman's hands go slack. Song drifts across the water — not hostile, but insistent. The Sirens are not enemies if approached as peers. Aello's feather (from Enc 1) opens parley automatically and earns immediate respect. Showing the Seal earns the same. The Siren's whispered warning is the only explicit hint about Sacrifice before the Kraken comes.
- Day 3 Evening — Between Encounters: The ship passes the Shoals. The sea is too calm. Theron asks someone to take the second watch and does not explain why he won't sleep tonight. The crew is quiet. The stars that were bright an hour ago are slowly being blocked out by something below the surface.
- Night 3 — Encounter 3 (Wrath of the Deep): The sea goes glassy and completely still. Then — silently — the first tentacle rises. The debt is calling. The party must sever enough tentacles to build escape speed, or invoke the Seal once (one tentacle withdraws), or sacrifice the Seal entirely to end it. The Maw surfaces when 4+ tentacles are severed, or on round 5 — whichever comes first. Regrown tentacles are the pressure that makes Sacrifice worth considering.
- Arrival at Threnoi — Aftermath: The high priest opens the amphora to reveal Kallinikos's handwritten oath of penance. The party was the instrument of a thirty-year-old promise finally delivered. Whether they feel used or honored is up to them. The high priest thanks them formally. The Seal, if kept, remains warm near open water forever afterward.
Encounter 1 — The Harpy Storm
Overview
Storm clouds spiral down from a clear sky and Harpies scream out of them, their song already threading through the crew's ears. High above, on massive grey-streaked wings, Aello the Storm Harpy Queen circles — she has tracked the ship since port. Her goal is the sealed amphora in the hold. She will drive every sailor overboard to get to it. The party's goal is to stop her — while keeping crew out of the water and the cargo hatch sealed.
- Style: Aerial boarding action — defend the crew from being lured overboard while keeping the hold locked
- Win Condition: Drive off or destroy all Harpies and force Aello to flee
- Subgoal: Keep at least 3 of 6 crew alive and aboard; each lost sailor increases rowing DCs in Encounter 3 by 1
Creatures (APL10 Hard — ~11,000 XP adjusted)
- 6× Harpy (CR 1, 200 XP each)
- 2× Tempest Harpy Lieutenant (CR 3, 700 XP each) — elite harpies with 60 ft. fly, Gale Scream (DC 13 CON, 2d6 thunder, pushed 5 ft.)
- 1× Aello, Storm Harpy Queen (CR 6, 2,300 XP) — APL10: HP 140, Legendary Resistance 2/day, Gale Shriek recharges on 5–6
Hard threshold (6×L10): 10,800 XP · Adjusted: ~11,000 XP (9 creatures × ×2 multiplier). Each crew member lost here increases Enc 3 rowing DC by 1.
Aftermath Rewards
- Aello's storm-gold feather (80 gp to collectors; vibrates near ocean creatures — Arcana DC 12 reveals it is tethered to something deeper; opens Siren parley automatically in Enc 2)
- A surviving charmed crew member mutters one phrase in Aquan they don't understand: "The deep toll must be paid"
- Crew morale intact → standard rowing DCs in Enc 3
🗺 Terrain & Features — Trireme Deck
Open-sea deck — 60×20 ft bow to stern · Captain Theron at the stern steering oar
- Mast & Rigging: 25 ft tall. Difficult terrain to climb (DC 12 Athletics). Atop the mast: advantage on ranged attacks vs. flying targets; disadvantage on melee. Creatures on rigging who are knocked prone fall.
- Oar Benches (both sides): Difficult terrain. Charmed crew seated here rise and walk toward the nearest railing.
- Cargo Hatch (center): Iron-reinforced lid. AC 16, 20 HP. Aello targets this on her first two turns — if opened she dives in next turn.
- Strong Headwind: Ranged weapon attack rolls against flying targets −2. Creatures with Fly speed gain +10 ft this encounter.
- Crew (6 sailors): Each starts within 10 ft of an oar bench. Charmed crew use all movement toward the nearest railing. They do not fight back.
Harder: Add 2 Harpies (6 total). Aello's Legendary Resistance refreshes once if she's dropped below 50 HP. Cargo Hatch only has 15 HP.
Mechanics
- At the top of each round, the 4 Harpies sing in concert. All humanoids within 300 ft that can hear must succeed DC 11 Wisdom save or be charmed. Charmed creatures are incapacitated and must use their full movement to approach the nearest Harpy by the most direct route.
- A creature that succeeds its save is immune to all Harpy Luring Song for 24 hours. Aello's Song (DC 15) is separate — a creature can be immune to one but not both.
- Ear Plugging: Action. A PC can jam wax, cloth, or rope into a willing adjacent creature's ears (or their own) — automatic immunity. Under combat stress: DC 10 Sleight of Hand. If improvised material is poor, the DM may require a save with advantage only.
- Captain Theron rolls his own save each round (Wis +1). If charmed, the ship begins drifting — the next round's rowing is impossible and the ship swings 45° off course.
- A charmed crew member who reaches the railing falls in (no save; they want to go). Drowning rules begin immediately. Recovering them requires a swimming action (Athletics DC 12) and uses the full movement of whoever jumps in.
- Grapple a Crew Member: Action; DC 11 Athletics contest to restrain them before they reach the railing. They remain charmed but cannot move.
- Tie a Crew Member to the Bench: Action; DC 8 Sleight of Hand. Safe from movement but still charmed (incapacitated).
- If 4+ crew go overboard, Theron is demoralized. Enc 3 rowing DCs increase by 2 (see Enc 3 mechanics).
- Round 1–2: Aello targets the Cargo Hatch with Talon attacks. She ignores PCs unless attacked.
- Round 3+: If the hatch is open (dealt 20 damage), Aello dives inside; she can be followed. Inside the hold she fights with full stats in a cramped 10×10 ft space.
- Aello flees when reduced below 25 HP or when all 4 Harpies are dead — she dives into the waves and does not resurface. She cannot negotiate; she is bound.
- Counter-Song (Bard or Instrument Proficiency): DC 16 Performance. All charmed creatures within 30 ft of the performer get a free repeat Wisdom save this round. On a natural 20, the effect extends to the whole ship. This draws Aello's personal wrath — she targets the performer exclusively.
- Distraction Offering: Drop a shiny item worth 50+ gp overboard → 1 Harpy dives for it, skipping its next turn on a failed DC 12 Wisdom save.
- Address Aello: DC 20 Persuasion/Intimidation. She is bound to a greater will and cannot stop — but she hesitates one full round, allowing the party a free action to secure the hatch or retreat.
Resolution
- The golden feather crackles faintly when held near the sea. Arcana DC 12: it is magically tethered to something far below — the attack was coordinated, not opportunistic.
- If the party shows the feather to the Sirens in Encounter 2, the Sirens' attitude shifts from indifferent to immediately respectful. Persuasion DCs for parley drop by 3.
Creature Cards
Harpy
Medium Monstrosity, Chaotic Evil · CR 1 (200 XP)
AC 11 | HP 38 (7d8+7) | Speed 20 ft., Fly 40 ft.
Senses: Passive Perception 10 | Languages: Common
Multiattack. One Claws + one Club attack.
Claws. +3 to hit, reach 5 ft. Hit: 6 (2d4+1) slashing.
Club. +3 to hit, reach 5 ft. Hit: 3 (1d4+1) bludgeoning.
Luring Song. Bonus action to maintain each round. All humanoids within 300 ft that can hear must succeed DC 11 Wis save or be charmed. Charmed: incapacitated, must move toward Harpy. Success: immune 24 hrs.
Aello, Storm Harpy Queen
Large Monstrosity (Harpy), Chaotic Evil · CR 6 (2,300 XP) · BOSS · APL10: HP 140
AC 14 (natural armor) | HP 97 (13d10+26) | Speed 20 ft., Fly 60 ft.
Saves: Wis +4, Cha +7 | Skills: Perception +4, Performance +7
Immunities: Lightning, Thunder | Senses: Darkvision 60 ft., Passive Perception 14
Flock Commander. Harpies within 30 ft have advantage on attacks against charmed or incapacitated targets.
Legendary Resistance (1/Day). Choose to succeed on a failed save.
Multiattack. Two Talon attacks.
Talon. +6 to hit, reach 5 ft. Hit: 10 (2d6+3) slashing.
Luring Song. All creatures within 300 ft that hear must succeed DC 15 Wis save or be charmed + incapacitated; move toward Aello on their turn. Repeat save at end of each turn. Success: immune 24 hrs.
Gale Shriek (Recharge 5–6). 30-ft cone: DC 14 Con save, 4d8 (18 avg) thunder on fail; pushed 10 ft + knocked prone. Half damage, no push on success.
Windborne Dash. Move up to 20 ft without provoking opportunity attacks.
Talon Strike (Cost 1). One Talon attack.
Rally the Flock (Cost 2). One Harpy within 60 ft may fly up to 30 ft and make one Claw attack as a free reaction.
Encounter 2 — The Siren's Shoals
Overview
As the sun touches the horizon on day 3, a jagged cluster of black rocks rises from the amber sea ahead — the Siren's Shoals. Three Sirens recline on the tallest rocks, their song already threading through the ship. The helmsman's hands have gone slack. The ship is beginning to turn toward the rocks. The party has time to act — but not much.
- Style: Skill challenge / social encounter — navigate a enchanted passage safely
- Win Condition: Pass the Shoals without the ship running aground — combat is never required
- Combat Trigger: Party attacks first, or fails all three skill phases and the ship grounds on the rocks
- Special: Showing Seal of the Deep to the Sirens or carrying Aello's feather immediately gains their respectful attention — opens parley automatically
🗺 Terrain & Features — Siren's Shoals Approach
Open sea, shoals cluster — 200 ft approach corridor between rocks, narrowing to 40 ft at the tightest point · dusk lighting (disadvantage on Perception checks beyond 120 ft)
- The Shoals: Rocks protrude 5–10 ft above water. Creatures can clamber onto them (DC 12 Athletics). The Sirens are on rocks 60 ft off each side of the ship's path.
- Current: The water between the rocks runs with a subtle Siren-guided current pulling toward the rocks. Each round the ship is not actively steered, it drifts 10 ft toward the nearest rock cluster.
- Collision Damage: If the ship strikes rocks: 2d10 structural damage (cosmetic in Enc 2; in Enc 3 reduce max Escape Progress by 1 per collision). Captain Theron's morale breaks.
Harder: Add 1 Sea Hag from beneath the ship on round 1 (even before combat is triggered). Sirens' Song affects the ship's hull too — dealing 1d6 structural damage per round they are unaddressed.
Mechanics
- Skill-primary: Negotiate passage, resist the song, or use the Seal — combat is avoidable.
- Hard pressure (if combat): 2× Siren CR 4 (1,100 XP ea.) + 1× Sea Hag CR 5 (1,800 XP) join if the party attacks or fails three saves — ~4,000 XP ×2 = ~8,000 before Enc 3.
Run this as 3 escalating rounds regardless of party approach. Each round, the party must address one element or things get worse.
- All creatures within 300 ft that can hear the Sirens must make DC 15 Wisdom saving throws or be charmed. The helmsman fails automatically (he has no bonus).
- The ship begins turning toward the rocks. If no PC takes the steering oar this round, the ship drifts 10 ft toward the closest rocks.
- Theron shouts to the party — he's stuffed wax in his ears already ("always carry wax," he says if later asked).
- A PC must be at the steering oar to keep the ship on course (DC 12 Water Vehicles or Navigator's Tools to hold course; failure = another 15 ft drift).
- A charmed crew member has climbed to the prow and is about to dive in. DC 11 Athletics to grapple them.
- If a PC initiates parley: Sirens pause their song for 1 round — this is their only interruption without combat. Use it.
- If the ship is still drifting toward rocks: DC 14 Water Vehicles or Strength (Athletics) to make an emergency turn. Failure = collision (see terrain notes).
- If parley has been opened: one Siren offers to guide the ship through the safe channel in exchange for a gift or deed (see Parley table below).
- If neither navigation nor parley has succeeded: the ship grounds. Sirens stop singing and approach the stricken vessel — combat begins on their terms (they are not surprised).
Initiating Parley — Any of These Opens It
- Display the Seal of the Deep visibly — automatic; Sirens recognize it and pause
- Display Aello's golden feather (from Enc 1) — automatic; Sirens become curious and respectful
- DC 14 Persuasion, Performance, or Arcana to call out appropriately to Fey
Siren's Exchange — Choose One
- Perform something beautiful: DC 14 Performance — the Sirens applaud and clear the path
- Answer their riddle correctly (see below): auto-success — they guide the ship through
- Offer a worthy gift: gems or pearls worth 50+ gp, or a deeply personal possession — they accept with grace
- DC 16 Persuasion to tell a compelling story of why the voyage matters — they are moved and stand aside
Accepted answers: A promise. A debt. An oath. Wrong answers prompt 1 round of full-strength song before the Sirens allow another attempt.
- If the party passes the Shoals peacefully and at least one Siren was engaged in parley, a Siren drifts alongside the ship as it passes and whispers (the words carry supernaturally, even through plugged ears): "The thing the old man gave you is not yours to keep. When the sea itself rises — debts repaid in kind make calm the deepest waters."
- This is a direct hint to sacrifice (not just invoke) the Seal in Encounter 3. Players who remember it are rewarded; those who forget still have the option.
- If combat starts: 3× Siren of the Shoals engage from their rocks (they have half-cover, +2 AC).
- On round 2 of combat: a Sea Hag surfaces beneath the ship and boards from the port side — she is their mistress and very angry.
- Sirens do not pursue if the ship sails away — they return to their rocks and resume singing. The party can disengage freely as long as they are moving away.
- Killing all Sirens: the channel is safe but the party receives no warning about the Seal. Theron is deeply unsettled. A Siren's silvery comb (worth 120 gp) can be recovered from the rocks.
Resolution
Creature Cards — Combat Only
These cards are only needed if the party triggers combat. Full stats in the Appendix.
Siren of the Shoals
Medium Fey (Siren), Chaotic Neutral · CR 4 (1,100 XP)
AC 12 | HP 52 (8d8+16) | Speed 30 ft., Swim 40 ft.
Saves: Wis +4, Cha +7 | Skills: Performance +9, Deception +7, Perception +4
Senses: Darkvision 60 ft., Passive Perception 14
Amphibious. Breathes air and water.
Alluring Presence. First attack against the Siren by a creature that can see it: DC 13 Wis save or make it with disadvantage.
Siren's Song. All creatures within 300 ft that hear: DC 15 Wis save or charmed 1 hour; must move toward water. Damage allows new save. Success: immune 24 hrs.
Coral Strike. +4 to hit, reach 5 ft. Hit: 9 (2d6+2) piercing. Target has disadvantage on its next Wisdom save.
Bewitching Gaze (Recharge 5–6). One creature within 30 ft: DC 15 Wis save or stunned until end of its next turn.
Beguiling Deflection. When targeted by an attack, force attacker: DC 13 Wis save or make attack with disadvantage (declare before roll).
Sea Hag
Medium Fey, Chaotic Evil · CR 5 (1,800 XP) · Sea Hag · Combat trigger only
AC 14 (natural armor) | HP 52 (7d8+21) | Speed 30 ft., Swim 40 ft.
Senses: Darkvision 60 ft., Passive Perception 11
Amphibious. Breathes air and water.
Horrific Appearance. First sight: DC 11 Wis save or frightened 1 minute. Success: immune 24 hrs.
Claws. +5 to hit, reach 5 ft. Hit: 10 (2d6+3) slashing.
Death Glare. One frightened creature within 30 ft that can see the hag: DC 11 Wis save or drop to 0 HP. Success: 3 (1d6) psychic.
Illusory Appearance. Appears as a beautiful person of her choice. Dispel DC 14; Insight vs. Deception (+5) to see through.
Encounter 3 — Wrath of the Deep (Boss)
Overview
The sea goes glassy and completely still. The stars vanish. Then — silently — massive Kraken Tentacles rise from the black water and wrap around the trireme's hull. The ship groans. Additional tentacles emerge on rounds 3 and 5. Sahuagin Raiders — drawn to the chaos — clamber over the gunwales on rounds 2 and 4. The Kraken cannot be killed; the only paths forward are escape or the Seal.
- Style: Desperate nautical escape — manage multiple threats while building Escape Progress
- Win Condition: Reach Escape Progress 6 (or 5 if ship was grounded in Enc 2) before the party is overwhelmed
- Alternate Win: Sacrifice the Seal of the Deep — instant escape, all tentacles retract
- The Kraken cannot be killed in this encounter — see The Kraken's Maw for details
Creatures (APL10 Deadly — ~21,000 XP adjusted)
- 5× Kraken Tentacle (start) — CR 3 (700 XP ea.) — APL10: HP 50 each
- +1 Tentacle on round 3 (6th) — CR 3, HP 50
- 3× Sahuagin Raider + 1× Sahuagin Champion (CR 4, 1,100 XP), round 2
- 3× Sahuagin Raider + 1× Sahuagin Champion (CR 4, 1,100 XP), round 4
- 1× Kraken's Maw — round 4 (APL10 faster surfacing) or when 4+ tentacles severed
Deadly threshold (6×L10): 16,800 XP · Adjusted: ~21,000 XP (16 creatures × ×3 multiplier, reduced one step for 6 players). Kraken's Maw is unkillable — its XP is not counted. Seal Sacrifice ends this encounter instantly regardless of Grip Counter.
Using Your Miniatures
- Place 4 tentacle minis at the start around the ship: port bow, starboard bow, port stern, starboard stern
- Round 3: add 5th tentacle mini (midship, port side)
- Round 5: add 6th tentacle mini (midship, starboard or mast)
- Severed tentacle: remove mini from table
- Kraken Head mini: place it 5 ft off the bow on round 5, or hold it back for dramatic reveal if 4+ tentacles are destroyed first
🗺 Terrain & Features — Trireme Deck (Night)
Same trireme deck — 60×20 ft · no moonlight · lanterns only (dim light beyond 20 ft from a lantern)
- Slick Deck: Seawater rushing over the sides. When a creature moves more than 15 ft in a single turn, DC 13 Dex save or fall prone at the end of that movement.
- Damaged Hull (if grounded in Enc 2): The hold takes on water — the ship lists 5° to port. Creatures moving westward (port) on deck must succeed DC 11 Dex save or slide 5 ft toward the railing.
- Mast & Rigging: Still climbable (DC 12 Athletics). Tentacle 6 (the late arrival) specifically targets the mast — on its first turn it tries to Seize the mast itself (treating it as a Large object, AC 15, 30 HP).
- Overboard: The water is ink-black. A creature that goes overboard is immediately pulled 30 ft down by a tentacle on the Kraken's next turn (DC 16 Strength save to resist). Swim back up: DC 14 Athletics; disadvantage while any tentacle is in the water.
Harder: Start with 4 tentacles, all with 50 HP. Sahuagin Raider waves are 3 each instead of 2. Maw surfaces on round 3. Invoke use of the Seal requires a DC 12 Charisma check (the Kraken resists briefly).
Mechanics
The Grip Counter equals the number of active (non-severed) tentacles currently clasping the hull. It starts at 4 and fluctuates. Every destroyed tentacle reduces it by 1. New tentacles on rounds 3 and 5 raise it by 1 each.
| Grip Counter | Ship Status | Escape Progress Action |
|---|---|---|
| 5–6 | Held fast — hull creaking, listing | No progress possible |
| 4 | Barely held — rowers straining | No progress possible |
| 3 | Slipping free — ship shudders | DC 15 Water Vehicles or Athletics to gain 1 Progress |
| 2 | Almost free — wake begins forming | DC 12 Water Vehicles or Athletics to gain 1 Progress |
| 1 | One tentacle remains | Automatic 1 Progress; may attempt DC 10 for a 2nd |
| 0 | Free! Sails fill | Automatic 2 Progress per round; escape next round |
🐙 Tentacle Tracker
Click a tentacle to mark it severed. Click again to restore (e.g., Kraken's Maw Legendary Action regrows one). Use "+ Emerge" when new tentacles appear on rounds 3 and 5.
Click each pip to mark progress. Pip 6 = the ship escapes. If ship was grounded in Enc 2, mark pip 6 as blocked — escape at pip 5.
- Each tentacle acts on initiative count 20 (loses ties). It takes one action per round.
- Hull-Grappling Tentacle (Tentacles 1, 2, 3, 4): Uses its action to Constrict — automatically deals 15 (2d8+6) bludgeoning to the ship's hull (narrative only; track Hull HP only if you want drama). On a creature it has Seized, it uses Drag instead.
- Free Tentacle (Tentacles 5, 6): Targets a PC with Slam or Seize.
- A tentacle switches between hull-grappling and creature-targeting if it has nothing to hold. DM chooses.
- Round 2: 2× Sahuagin Raiders clamber over the port gunwale (Medium creatures, no Athletics check needed). They begin adjacent to the midship oar benches.
- Round 4: 2 more Raiders board from starboard.
- Raiders drawn overboard by tentacles may climb back up on a DC 12 Athletics check on their turn — they have 40 ft Swim and will board again if able.
- Raiders use Blood Frenzy freely — they target whichever creature on deck has the lowest HP.
- Invoke (Action, once): Hold the Seal of the Deep aloft and speak Poseidon's name. One tentacle of your choice immediately withdraws — remove its mini, reduce Grip Counter by 1. It cannot be regrown by the Kraken's Maw Legendary Action.
- Sacrifice (Action, permanent): Throw the Seal into the open water while calling Poseidon's name. The Kraken immediately releases all tentacles, the Kraken's Maw submerges, and all Sahuagin Raiders dive back into the sea. Encounter ends. The Seal is gone forever. Kallinikos, when told, says: "Good. That is how it was always meant to end."
- The Kraken's Maw surfaces on round 5, or whenever 4 or more tentacles have been severed (it rises in fury) — DM's choice of which trigger to use.
- Place the head mini 5 ft off the ship's bow. It acts on its own initiative (roll separately, or use initiative 15).
- While the Maw is visible: severed tentacles regrow (Legendary Action, Cost 1) — this creates real pressure to consider the Seal sacrifice.
- The Maw cannot be killed this encounter (HP never goes below 1). Damaging it causes it to flinch dramatically but it does not retreat unless the Seal is sacrificed or all tentacles are severed AND Escape Progress reaches 6.
Resolution
- If the amphora survived: the high priest at Threnoi opens it to reveal Kallinikos's handwritten oath of penance — an old man settling a lifelong debt. The party was the instrument of a thirty-year-old promise.
- If the amphora was taken by Aello in Enc 1: the high priest is disappointed but accepts the news. He mentions the Seal was already "repayment enough" — Kallinikos knew what he was sending.
- Reward (suggested): 1,200 gp (delivery fee + bonus from the temple treasury), a Potion of Water Breathing per PC, and a formal letter of commendation from the Temple of Poseidon (useful as a story hook or social credential).
Creature Cards
Kraken Tentacle
Huge Appendage (Kraken), Neutral Evil · Encounter CR 3 per segment (700 XP ea.)
AC 12 (natural armor) | HP 40 (each) | Speed 0 ft.
Resistances: Cold; Bludgeoning, Piercing, Slashing from nonmagical weapons
Condition Immunities: All conditions | Senses: Blindsight 30 ft.
Mindless Appendage. Acts on initiative 20. No mind — immune to charm, fear, or social effects. Reducing to 0 HP severs the tentacle; remove its mini and reduce Grip Counter by 1.
Regeneration (Maw Active). If the Kraken's Maw is surfaced, one severed tentacle can be regrown by the Maw's Legendary Action (Cost 1); it returns with 20 HP and Grip Counter rises by 1.
Slam. +8 to hit, reach 20 ft. Hit: 15 (2d8+6) bludgeoning. Target: DC 16 Str save or knocked prone.
Seize. +8 to hit, reach 20 ft, one Large or smaller target. Hit: 13 (2d6+6) bludgeoning, target grappled (escape DC 16) and restrained while grappled.
Drag (Grappled Target Only). Grappled target: DC 16 Str save or dragged 20 ft toward the sea. A creature dragged off the ship's edge falls into the water.
The Kraken's Maw
Gargantuan Monstrosity (Kraken, Partial), Neutral Evil · Unkillable — see trait
AC 18 (natural armor) | HP 250 (cannot drop below 1) | Speed 0 ft. (head only)
Saves: Str +14, Dex +3, Con +11, Int +10, Wis +8, Cha +9
Immunities: Lightning, Thunder; nonmagical B/P/S | Condition Immunities: frightened, paralyzed, prone
Senses: Truesight 120 ft., Passive Perception 18
Encounter Rule (Unkillable). The Maw's HP cannot drop below 1 during this encounter. Escape is the goal, not defeat. The Seal of the Deep (sacrifice) immediately ends this encounter regardless of HP or tentacle count.
Legendary Resistance (3/Day). Choose to succeed on a failed save.
Reactive (3 Reactions/Round). Can take up to 3 reactions per round, each different.
Multiattack. One Bite + Thunderous Bellow.
Bite. +14 to hit, reach 10 ft. Hit: 29 (3d12+10) piercing. Reduced to 0 HP: swallowed — blinded, restrained; 21 (6d6) acid at start of each of Kraken's turns.
Thunderous Bellow. All creatures within 60 ft: DC 19 Con save, 4d8 (18 avg) thunder on fail + deafened 1 min. Half, no deafen on success.
Tentacle Surge (Cost 1). One severed tentacle regrows with 20 HP. Grip Counter +1.
Crash Wave (Cost 2). All creatures on deck: DC 16 Dex save or 2d8 (9 avg) bludgeoning + knocked prone.
Ink Cloud (Cost 3, 1/Day). 60-ft radius centered on the Maw: heavily obscured until end of Kraken's next turn.
Sahuagin Raider
Medium Humanoid (Sahuagin), Lawful Evil · CR 1/2 (100 XP)
AC 12 (natural armor) | HP 22 (4d8+4) | Speed 30 ft., Swim 40 ft.
Skills: Perception +5 | Senses: Darkvision 120 ft., Passive Perception 15
Blood Frenzy. Advantage on melee attacks against any creature not at full HP.
Limited Amphibiousness. Breathes air and water; must submerge at least 1 hour per 4 hours or begins suffocating.
Multiattack. One Bite + two Claw, or one Trident + one Bite.
Bite. +3 to hit, 5 ft. Hit: 3 (1d4+1) piercing.
Claws. +3 to hit, 5 ft. Hit: 3 (1d4+1) slashing.
Trident. +3 to hit, 5 ft or 20/60 ft. Hit: 4 (1d6+1) piercing; 5 (1d8+1) two-handed.
⚖️ Difficulty Scaling
As Written ★ — 6 Players, Average Level 10
- Baseline for this guide. Encounter 1 is Hard (~11,000 XP adjusted); Encounter 2 is avoidable/skill; Encounter 3 is Deadly (~21,000 XP adjusted) for six PCs at average level 10.
- XP thresholds (6×L10): Hard ≈ 10,800 · Deadly ≈ 16,800. Encounter 3's effective difficulty is governed by Grip Counter and Escape Progress — the Kraken's Maw is unkillable, so raw XP understates the pressure.
- Seal of the Deep changes difficulty dramatically: Invoke reduces Grip Counter by 1 at any time; Sacrifice ends the encounter instantly. The party that understands both options from Enc 2's Siren warning faces a strategic choice at the critical moment.
- Crew survival from Enc 1 gates Enc 3 rowing DCs: each sailor lost +1 DC (up to +3 at 4+ lost). This creates a persistent consequence chain across the session.
Library Standard — 6 Players, Average Level 8
- Enc 1: 4 Harpies + 1 Aello (standard stats, HP 97, 1 Legendary Resistance). No Tempest Lieutenants.
- Enc 2: Standard skill DCs (not reduced). 3 Sirens. Parley proceeds as written.
- Enc 3: Start with 4 Tentacles (HP 40 each). Sahuagin Raider waves of 2 (no Champions). Maw surfaces round 5. All DCs −1 from APL10.
Easier (APL 8–9)
- Apply Library Standard. Additionally: Enc 1 Harpies reduced to 2; Aello does not use Gale Shriek. Enc 3: No 6th tentacle; Sahuagin HP 14 each; Maw does not surface. All DCs −1 from Library Standard.
Harder (APL 11–12)
- Enc 1: 6 Harpies + 2 Tempest Lieutenants + Aello (HP 140, Legendary Resistance 2/day, Gale Shriek recharges 5–6). Cargo Hatch HP 15. Harpy Lieutenants have Gale Scream (DC 14 CON, 3d6 thunder, push 10 ft.).
- Enc 2: Sea Hag surfaces on round 1 even before combat is triggered. Sirens' song deals 1d6 structural damage to the ship per round unaddressed.
- Enc 3: 5 Tentacles start (HP 50 each). Sahuagin waves of 4+1 Champion. Maw surfaces round 3. Seal Invoke requires DC 12 CHA check (Kraken briefly resists). All DCs +1.
📋 Appendix — Cards
Full stat blocks for every creature, NPC, and item in this session. Click any tag-link in the encounter text to pop these up as modals.
Creature Cards
Harpy
Medium Monstrosity, Chaotic Evil · CR 1 (200 XP)
AC 11 | HP 38 (7d8+7) | Speed 20 ft., Fly 40 ft.
Senses: Passive Perception 10 | Languages: Common
Multiattack. One Claws + one Club attack.
Claws. +3 to hit, reach 5 ft. Hit: 6 (2d4+1) slashing.
Club. +3 to hit, reach 5 ft. Hit: 3 (1d4+1) bludgeoning.
Luring Song. Bonus action to maintain each round. All humanoids within 300 ft that can hear: DC 11 Wis save or charmed. Charmed: incapacitated, must move toward Harpy. Success: immune 24 hrs.
Aello, Storm Harpy Queen
Large Monstrosity (Harpy), Chaotic Evil · CR 6 (2,300 XP) · BOSS · APL10: HP 140
AC 14 (natural armor) | HP 97 (13d10+26) | Speed 20 ft., Fly 60 ft.
Saves: Wis +4, Cha +7 | Skills: Perception +4, Performance +7
Immunities: Lightning, Thunder | Senses: Darkvision 60 ft., Passive Perception 14
Languages: Auran, Common
Flock Commander. Harpies within 30 ft have advantage on attacks against charmed or incapacitated targets.
Legendary Resistance (1/Day). Choose to succeed on a failed save.
Multiattack. Two Talon attacks.
Talon. +6 to hit, reach 5 ft. Hit: 10 (2d6+3) slashing.
Luring Song. All within 300 ft that hear: DC 15 Wis save or charmed + incapacitated; must move toward Aello. Repeat save end of each turn. Success: immune 24 hrs.
Gale Shriek (Recharge 5–6). 30-ft cone: DC 14 Con save, 4d8 (18 avg) thunder on fail + pushed 10 ft + prone. Half, no push on success.
Windborne Dash. Move 20 ft without provoking opportunity attacks.
Talon Strike (Cost 1). One Talon attack.
Rally the Flock (Cost 2). One Harpy within 60 ft flies 30 ft and makes one Claw attack as a free reaction.
Siren of the Shoals
Medium Fey (Siren), Chaotic Neutral · CR 4 (1,100 XP)
AC 12 | HP 52 (8d8+16) | Speed 30 ft., Swim 40 ft.
Saves: Wis +4, Cha +7 | Skills: Performance +9, Deception +7, Insight +4, Perception +4
Senses: Darkvision 60 ft., Passive Perception 14 | Languages: Aquan, Common, Elvish
Amphibious. Breathes air and water.
Alluring Presence. A creature that can see the Siren and makes its first attack against it must succeed DC 13 Wis save or make that attack with disadvantage.
Siren's Song. All within 300 ft that hear: DC 15 Wis save or charmed 1 hour; must move toward water on their turn. Damage forces new save. Success: immune 24 hrs.
Coral Strike. +4 to hit, reach 5 ft. Hit: 9 (2d6+2) piercing. Target has disadvantage on its next Wisdom saving throw.
Bewitching Gaze (Recharge 5–6). One target within 30 ft: DC 15 Wis save or stunned until end of its next turn.
Beguiling Deflection. When targeted by an attack, force attacker: DC 13 Wis save or attack made with disadvantage (declare before roll).
Sea Hag
Medium Fey, Chaotic Evil · CR 5 (1,800 XP)
AC 14 (natural armor) | HP 52 (7d8+21) | Speed 30 ft., Swim 40 ft.
Senses: Darkvision 60 ft., Passive Perception 11 | Languages: Aquan, Common, Giant
Amphibious. Breathes air and water.
Horrific Appearance. First sight: DC 11 Wis save or frightened 1 minute. Success: immune 24 hrs.
Claws. +5 to hit, reach 5 ft. Hit: 10 (2d6+3) slashing.
Death Glare. One frightened creature within 30 ft that can see the Hag: DC 11 Wis save or drop to 0 HP. Success: 3 (1d6) psychic.
Illusory Appearance. Covers herself in illusion to appear beautiful. Ends if she dies or takes a bonus action to end it. Dispel DC 14; Insight vs. Deception (+5) to detect.
Kraken Tentacle
Huge Appendage (Kraken), Neutral Evil · Encounter CR 3 per segment (700 XP ea.)
AC 12 (natural armor) | HP 40 (each) | Speed 0 ft.
Resistances: Cold; nonmagical Bludgeoning, Piercing, Slashing
Condition Immunities: All conditions | Senses: Blindsight 30 ft.
Mindless Appendage. Acts on initiative 20. No mind. Severing (0 HP): remove mini, reduce Grip Counter by 1.
Regeneration (Maw Active). While Kraken's Maw is surfaced, can be regrown by Maw Legendary Action (Cost 1) at 20 HP; Grip Counter +1.
Slam. +8 to hit, reach 20 ft. Hit: 15 (2d8+6) bludgeoning. DC 16 Str save or knocked prone.
Seize. +8 to hit, reach 20 ft. Hit: 13 (2d6+6) bludgeoning + grappled (escape DC 16) + restrained while grappled.
Drag (Grappled Only). DC 16 Str save or dragged 20 ft toward sea. Off the edge = overboard.
The Kraken's Maw
Gargantuan Monstrosity (Kraken, Partial), Neutral Evil · Unkillable — see trait
AC 18 (natural armor) | HP 250 (cannot drop below 1) | Speed 0 ft. (head only surfaced)
Saves: Str +14, Dex +3, Con +11, Int +10, Wis +8, Cha +9
Immunities: Lightning, Thunder; nonmagical B/P/S | Condition Immunities: frightened, paralyzed, prone
Senses: Truesight 120 ft., Passive Perception 18
Encounter Rule (Unkillable). Cannot be reduced below 1 HP. Escape is the objective. Seal of the Deep sacrifice ends this encounter immediately.
Legendary Resistance (3/Day). Choose to succeed on a failed save.
Reactive (3 Reactions/Round). May take up to 3 different reactions per round.
Multiattack. One Bite + Thunderous Bellow.
Bite. +14 to hit, reach 10 ft. Hit: 29 (3d12+10) piercing. 0 HP: target swallowed (blinded, restrained; 21 (6d6) acid at start of each Kraken turn).
Thunderous Bellow. All within 60 ft: DC 19 Con save, 4d8 (18 avg) thunder + deafened 1 min on fail. Half, no deafen on success.
Tentacle Surge (Cost 1). One severed tentacle regrows at 20 HP. Grip Counter +1.
Crash Wave (Cost 2). All creatures on deck: DC 16 Dex save or 2d8 (9 avg) bludgeoning + knocked prone.
Ink Cloud (Cost 3, 1/Day). 60-ft radius: heavily obscured until end of Kraken's next turn.
Sahuagin Raider
Medium Humanoid (Sahuagin), Lawful Evil · CR 1/2 (100 XP)
AC 12 (natural armor) | HP 22 (4d8+4) | Speed 30 ft., Swim 40 ft.
Skills: Perception +5 | Senses: Darkvision 120 ft., Passive Perception 15
Languages: Sahuagin
Blood Frenzy. Advantage on melee attacks against any creature not at full HP.
Limited Amphibiousness. Breathes air and water; must submerge at least 1 hr per 4 hrs or begins suffocating.
Shark Telepathy. Magically commands sharks within 120 ft.
Multiattack. One Bite + two Claw, or one Trident + one Bite.
Bite. +3 to hit, 5 ft. Hit: 3 (1d4+1) piercing.
Claws. +3 to hit, 5 ft. Hit: 3 (1d4+1) slashing.
Trident. +3 to hit, 5 ft or 20/60 ft ranged. Hit: 4 (1d6+1) piercing; 5 (1d8+1) two-handed.
NPC Cards
Kallinikos
NPC — Blind Sea Oracle & Questgiver · No combat stat block
Ancient man, mid-70s. White beard braided with sea-glass beads. Clouded white eyes — blind for thirty years. Moves by touch and smell along the docks he has tended for four decades. Always smells of brine and old cedar even indoors.
Kallinikos owes Poseidon's court a debt of blood — thirty years ago a Nereid calmed a storm that should have killed his entire crew. Half his sailors died anyway. The sealed amphora carries his written oath of penance, composed over three decades. Delivering it finally settles the account. The Kraken is Poseidon's test, not his enemy.
He knows the Kraken will come. He knew before the party left port. He said nothing because he feared they would refuse the job — and the debt must be paid while he still lives to commission it. He is ashamed of this. If the party returns safe, he does not defend himself; he just says, "I am sorry. I knew."
Measured. Never raises his voice. Uses nautical metaphors for everything ("Some debts can't be reckoned until the tide turns"). Deflects direct questions with philosophical tangents. His blindness does not slow him; he navigates the familiar docks with complete confidence.
Captain Theron
NPC — Trireme Captain · Veteran stat block if combat (CR 3)
AC 17 (breastplate + shield) | HP 58 (9d8+18) | Speed 30 ft.
Gruff, practical, fiercely proud of his ship. Won't spend sailors on someone else's gamble — but once committed, unshakeable. Respects competence over titles. Privately terrified of deep-ocean nights; he has bad dreams since leaving port.
Multiattack. Two Shortsword attacks. +5 to hit, 1d6+3 piercing.
Parry (Reaction). Adds +2 to AC against one melee attack that would hit him; must have a melee weapon in hand.
Commands the rowers. Grants +4 to one Water Vehicles or Athletics check per round (his bonus action, free to the party). Reduced to +2 if 4+ crew were lost in Enc 1 (he is demoralized). Will fight Sahuagin if they get near the steering oar.
Theron has sailed past the Shoals twice. Once he stuffed his ears with pitch, but once he listened for two full seconds before catching himself. He has never told anyone. He recognizes the Sirens' singing style and avoids eye contact when the topic comes up. Insight DC 13.
Item Cards
Seal of the Deep
Wondrous Item (requires attunement) · Heirloom — Not for Sale · Given by Kallinikos
A palm-sized bronze medallion on a fraying leather cord, engraved with a three-pronged trident encircled by stylized ocean waves. Always cool to the touch. Smells faintly of brine even in a sealed pouch. Hums almost imperceptibly near open water.
Warding Aura (Passive). While attuned and holding the Seal, you have advantage on saving throws against fear effects caused by aquatic creatures.
Invoke (Action — 1/Encounter). Hold the Seal aloft and speak Poseidon's name. One Kraken Tentacle (or similar aquatic grapple) within 60 ft immediately releases its hold and withdraws — remove its mini, reduce Grip Counter by 1. This withdrawal cannot be reversed by the Maw's Tentacle Surge.
Sacrifice (Action — Permanent). Throw the Seal into open water while speaking Poseidon's name. The Kraken immediately releases all holds, the Maw submerges, Sahuagin raiders dive back into the sea. Encounter ends. The Seal is lost forever and cannot be recovered.
Crafted for Kallinikos's grandfather by a Nereid of Poseidon's court in exchange for a promise — the terms of which are in the sealed amphora. The Seal is essentially an unredeemed favor from Poseidon's court: invoking it calls in one moment of mercy; sacrificing it cancels the entire ancient debt. Kallinikos knew both options when he gave it away.
Reward Cards
Post-session keepables. Reward is the first tag. Mechanics below are for ongoing use after this oneshot.
Seal of the Deep
Reward · Wondrous · 1/Long Rest
Mechanics. Once per long rest, as an action, hold the Seal aloft and speak Poseidon's name. Choose one Huge or larger aquatic creature, or one tentacle/lair feature within 60 feet: it must succeed on a DC 16 Wisdom saving throw or immediately withdraw to a safe distance, ending any grapple it maintains and becoming unable to attack you until the end of its next turn. While carried, sea beasts of CR 2 or lower are hesitant to attack you first if another target is available.
Appearance. A heavy sea-green seal stamped with a closed eye and a trident, always damp with cold brine.
Lore. Kallinikos's courier seal — kept when the party repaid the deep without surrendering Poseidon's mark.
Quote. "Debts repaid in kind make calm the deepest waters." — Siren hint
Earn when: Survive the crossing while keeping the Seal (invoke it, but do not sacrifice it to end the Maw fight).
Aello's Storm-Gold Feather
Reward · Wondrous · 1/Short Rest
Mechanics. While carried, the feather vibrates when an aberration, elemental, or monstrosity with a swimming speed is within 120 feet (DM confirms direction on a successful DC 12 Arcana check). Once per short rest, as an action, present the feather: one fey, harpy, or siren within 30 feet has its attitude shift one step toward friendly for 10 minutes, and Charisma checks to parley with it are made with advantage during that time.
Appearance. A harpy primary feather sheathed in crackling gold, smelling of ozone and wet rope.
Lore. Trophy of the coordinated harpy strike — tethered to whatever waited beneath the Aegean toll.
Quote. "The attack was coordinated, not opportunistic." — Arcana reading on the feather
Earn when: Take Aello's golden feather from the harpy assault (especially if the Seal is later sacrificed).