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Boiling Shoals Lurker - AI-generated fantasy Monster

Boiling Shoals Lurker

Early reports blamed a solitary scavenger for stolen catches, but no person was ever found. The culprit is an animal that follows vibrations in the water and attacks from cover. Its den can hold lost fishing gear and belongings taken from missing travelers.

Monsters
Large monstrosity · CR 3 , 700 XP · Uncommon

Boiling Shoals Lurker

A heat-adapted ambush predator of mineral-rich volcanic shallows, mistaken by frightened fishers for a lone scavenger hiding in the steam.
AC14
HP59/59
CR3 , 700 XP
Init
STR
DEX
CON
INT
WIS
CHA
ConditionsNone

Combat

AC 14 · HP 59 · CR 3 , 700 XP

Boiling Shoals Lurker

Large monstrosity, unaligned
Armor Class14
Hit Points59 (7d10 + 21)
Speed
30 ft.,
Swim 40 ft.
STR
DEX
CON
INT
WIS
CHA
Saving ThrowsConstitution
SkillsPerceptionStealth
Damage Resistances
Fire
Weaknesses
Forcing it onto dry ground removes the Stealth Advantage granted by Shoal Camouflage.
Senses
Darkvision 60 ft.,
Passive Perception 12
Challenge3 , 700 XP
Initiative+2 (12)
Proficiency Bonus+2
Passive Perception12
Amphibious. The lurker can breathe air and water.
Shoal Camouflage. The lurker has Advantage on Dexterity (Stealth) checks made to hide while submerged in warm, mineral-rich water or within natural steam.
Shoal-Bred. The lurker ignores Difficult Terrain created by shallow water, loose volcanic gravel, or natural steam vents. While in water, it has Advantage on ability checks and saving throws made to avoid being knocked Prone.

Actions

Bite. Melee Attack Roll: +6, reach 10 ft. Hit: 11 () Piercing damage plus 3 () Fire damage. If the target is Large or smaller, it has the Grappled condition (escape ) and the Restrained condition until the grapple ends. While the lurker has a creature grappled this way, it can't Bite another target.
Fissure Drag. The lurker makes one Bite attack against a creature it is grappling. On a hit, the target takes an extra 7 () Fire damage, and the lurker moves up to half its Swim Speed, pulling the target with it. The lurker can't use Fissure Drag against a creature it has not grappled.
Steam Blast (Recharge 5–6). Dexterity Saving Throw: , each creature in a 15-foot Cone. Failure: 14 () Fire damage. Success: Half damage. The area is Heavily Obscured until the start of the lurker's next turn.

Reactions

Slip Through the Steam. Trigger: A creature the lurker can see misses it with a melee attack while the lurker is in water and not grappling a creature. Response: The lurker moves up to 10 feet without provoking Opportunity Attacks.
Role
Ambush predator and grappling controller
Built for
Designed for a party facing a Challenge 3 creature

Gear

  • Basalt plates and glass scales (Natural armor, A handful of intact glass scales is worth 25 gp to a local artisan.)Grown, overlapping armor plates that shed glassy scales over time.

Notes for the game master

The grapple and restrained effects of Bite end when the grapple ends.
The lurker can grapple only one target with Bite and cannot Bite another target while holding that creature.
Fissure Drag requires a creature already grappled by the lurker.
Shoal Camouflage grants Advantage only in warm, mineral-rich water or natural steam.
The creature withdraws at 15 Hit Points or fewer, or after losing its grappled target.

Tactics

  1. Opening

    Remain submerged or within natural steam, using Shoal Camouflage to approach. Bite an isolated creature near the water's edge and pull it away from support.

  2. Mid-fight

    Use Fissure Drag to haul a grappled target toward hot water or a fissure. Use Steam Blast when several foes gather within the cone, then exploit the obscured area to reposition.

  3. End of the fight

    If it is at 15 Hit Points or fewer, or loses its grappled target, the lurker withdraws toward a lava tube rather than risking a fight on dry ground.

  4. Retreat

    The lurker is a wary animal, not a fighter to the death. It retreats at the listed threshold or when driven from water and faced with organized resistance.

How it fights

Choose an isolated target close to water rather than charging the whole party.
Drag a grappled target toward a fissure or deeper pool, forcing allies to decide whether to pursue.
Use steam to obscure the scene and break line of sight before retreating.
Avoid prolonged combat on dry ground.

Who it attacks first

An isolated creature standing near the water's edge.
A creature attempting to rescue a grappled target, if it can be attacked without leaving the water.
Otherwise, the nearest threat that enters its shallow-water hunting ground.

Works well with

Steam vents and narrow channels help it split a group and exploit its camouflage.
Fissures and unstable shallows make Fissure Drag a more urgent threat, but provide visible environmental hazards for players to use tactically.

How to beat it

Fight from dry ground and use ranged attacks to avoid its favored approach.
Step clear of steam to reduce the lurker's opportunities to hide.
Use the Help action or forced movement to break the grapple and free the restrained target.
A well-fed lurker can be lured away with fresh fish tossed into a distant pool.

Ways to avoid a fight

Fresh fish thrown into a distant pool can draw a well-fed lurker away from a crossing.
A coastal guide may know a safe route through the shoals and share it in exchange for help clearing a fishing ground.
The creature can be driven away by making the water and steam around its ambush site unsafe for it, without pursuing it into its lava tube.

Ecology

A thick, serpentine body rolls beneath the steaming surface, armored in overlapping plates of black basalt. Glassy scales shed as it grows, leaving bright shards caught among the rocks. Its blunt head breaks the water with a hiss, and heat ripples distort the air around its jaws.

Behavior

It stays submerged, reading footfalls and splashes through the shallows. The lurker strikes at creatures standing alone near the water, then drags them toward a hot fissure. It rarely follows prey onto dry ground.

How it lives

It hunts fish and other animals in heated coastal pools, favoring places where shallow channels meet volcanic fissures. Glassy scales slough off as its basalt plates renew, and its den may accumulate fishing gear and other objects dragged into the water.

Lair

The lurker shelters in a submerged lava tube connected to warm, shallow pools. The tube may be near a fissure where hotter water and tremors threaten harbor pilings and farms.

Habitat
Warm, mineral-rich coastal pools, volcanic shoals, steaming shallows, and fissure-fed water along the Ashen Shelf.

Signs that it is near

Freshly shattered glassy scales glinting among black stones.
Fish vanish from a patch of warm water while the surrounding shallows remain still.
Steam curls against the wind above a pool that smells sharply of minerals.
A trail of drag marks ends abruptly at a steaming fissure.

Tags

volcanic,
coastal,
ambush,
grappler,
steam,
aquatic

Lore

Early reports blamed a solitary scavenger for stolen catches, but no person was ever found. The culprit is an animal that follows vibrations in the water and attacks from cover. Its den can hold lost fishing gear and belongings taken from missing travelers.

What drives it

Feed safely, defend its favored hunting waters, and withdraw when injured or deprived of its advantage.

After the fight

A rescued fisher may know which channels are safe at low tide, while the recovered gear and glass scales can help rebuild trust between dock crews and local guild authorities. If left undisturbed, the lurker returns to hunting near its fissure, whose rising heat and tremors may continue to threaten harbor pilings and nearby farms.

“The culprit is an animal that follows vibrations in the water and attacks from cover.”
From its lore

Hooks

Plot hooks

Missing fishers have halted trade at a small Shelf port, and the Guild blames the dock crews.
A collector offers a high price for intact volcanic-glass plates, putting pressure on fishers to take risks near the lurker's den.
The lurker's den lies beside a fissure venting hotter water and tremors, threatening nearby farms and harbor pilings.

How to use it

An ambush in a volcanic tidal pool, where rescuing a grappled companion matters more than dealing damage quickly.
A crossing scene in which steam and shallow channels obscure safe footing.
A local conflict where fishers need the predator removed or diverted without damaging a vital fishing ground.

Treasure

A handful of intact glass scales worth 25 gp to a local artisan.
Lost fishing gear and an item belonging to a missing traveler may lie in the den.

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