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Gutter-Jaws - AI-generated fantasy Monster

Gutter-Jaws

Folklore tells of a river god that took the form of a crocodile to punish a greedy king who dumped his gold into the swamp. In reality, Gutter-Jaws is simply a relic of a bygone era, a living fossil that survived through sheer size and brutality. Adventurers have died trying to 'scavenge' the mossy log in the center of the shallows, only to realize the log has teeth.

Monsters
Gargantuan beast · CR 13 · Unique

Gutter-Jaws

A gargantuan, moss-covered prehistoric crocodile of terrifying size and patience.
AC18
HP217/217
CR13
Init
STR
DEX
CON
INT
WIS
CHA
ConditionsNone

Combat

AC 18 · HP 217 · CR 13

Gutter-Jaws

Gargantuan beast (dinosaur), unaligned
Armor Class18 (Natural Armor)
Hit Points217 (14d20 + 84)
Speed
30 ft. walk,
50 ft. swim
STR
DEX
CON
INT
WIS
CHA
Saving ThrowsStrengthConstitutionWisdom
SkillsStealthPerceptionAthletics
Damage Resistances
Bludgeoning, Piercing, and Slashing from Nonmagical Attacks
Immunities
None
Weaknesses
None
Senses
Blindsight 60 ft.,
Passive Perception 16
Languages
None
Challenge13
Proficiency Bonus+5
False Appearance. While Gutter-Jaws remains motionless in water, it is indistinguishable from a large floating log.
Hold Breath. Gutter-Jaws can hold its breath for 30 minutes.
Legendary Resistance (3/Day). If Gutter-Jaws fails a saving throw, it can choose to succeed instead.
Blood Scent. Gutter-Jaws has advantage on Wisdom (Perception) checks that rely on smell and can track creatures that are below their maximum hit points from up to a mile away if they are in the same body of water.

Actions

Multiattack. Gutter-Jaws makes two attacks: one with its bite and one with its tail.
Bite. Melee Weapon Attack: to hit, reach 10 ft., one target. Hit: 33 () piercing damage. If the target is a creature, it is grappled (escape ). Until this grapple ends, the target is restrained, and Gutter-Jaws can't bite another target.
Tail. Melee Weapon Attack: to hit, reach 15 ft., one target. Hit: 20 () bludgeoning damage. If the target is a creature, it must succeed on a Strength saving throw or be knocked prone.
Death Roll. Gutter-Jaws rolls violently while holding a grappled creature. The creature must make a Strength or Dexterity saving throw (target's choice). On a failure, the creature takes 45 () bludgeoning damage and is stunned until the end of its next turn. On a success, it takes half as much damage and is not stunned.

Reactions

Snap Back. When a creature within 10 feet of Gutter-Jaws misses it with a melee attack, Gutter-Jaws can make one Bite attack against that creature.

Legendary Actions

Tail Swipe. Gutter-Jaws makes one tail attack.
Lurk. Gutter-Jaws moves up to its swim speed without provoking opportunity attacks and takes the Hide action if it is in water.
Thrash (Costs 2 Actions) (costs 2 actions). Gutter-Jaws thrashes its body. Each creature within 10 feet of it must succeed on a Dexterity saving throw or take 14 () bludgeoning damage and be pushed 10 feet away.
Role
Solo Apex Predator
Built for
10 to 12

Gear

  • Iron-bound Trade Chest (Treasure, 2,500 gp)A heavy chest stuck in the silt, containing spices (now ruined) and 2,500 gold pieces.

Feats

Tough
Great Fortitude

Augmentations

None

Notes for the game master

High HP and legendary resistances make it a 'tank' style encounter.
Use Death Roll primarily against casters or low-Strength targets.

Tactics

  1. Opening

    Gutter-Jaws begins combat submerged. It waits for a creature to step within 10 feet of the water's edge or pass over it in a boat, then uses its Bite to initiate a grapple and pull the victim underwater.

  2. Mid-fight

    It focuses on maintaining the grapple on one target while using its Tail to keep other melee combatants at bay or knocking them prone. It uses Death Roll every time its action is available while a target is grappled.

  3. End of the fight

    If reduced to below 50 HP, it attempts to drag its grappled victim into deeper water (60+ feet) to drown them while ignoring other attackers.

  4. Retreat

    Gutter-Jaws is highly territorial. It will not flee unless it is reduced to 20 HP or fewer, at which point it dives into the deepest silt-channels and disappears.

How it fights

Drag targets into deep water to force drowning rules.
Use Legendary Actions to reposition frequently.
Target the creature with the lowest Strength first for the Bite.

Who it attacks first

Creatures in the water
Smallest/Weakest looking creatures
Creatures touching its treasure chest

Works well with

Hazardous Water: Combine with whirlpools or difficult terrain (deep mud).
Leeches: Add swarms of leeches that attach to players while they deal with Gutter-Jaws.

How to beat it

Freedom of Movement spell
Banishment
Long-range flying attackers
High AC Strength-based fighters

Ways to avoid a fight

Offering a massive carcass (like a freshly killed moose) as a distraction to search the chest.
Using Animal Handling (DC 25) to pacify it temporarily with food and submissive posturing.

Ecology

Gutter-Jaws is a sixty-foot-long Deinosuchus with scales as thick as iron plates, caked in centuries of silt, moss, and river-rot. When floating in the Blood Shallows, it is indistinguishable from a massive, decaying log. Its eyes are a dull, predatory amber and its mouth, when opened, reveals a cavernous gullet and teeth the size of shortswords.

Behavior

Gutter-Jaws is a patient lurker. It does not chase prey across the land but waits for it to come within range of the water's edge. It has become strangely possessive of a specific area in the Blood Shallows where a heavy, iron-bound chest from a sunken barge is wedged between stones, using it as an anchor for its territory.

How it lives

As an apex predator of a prehistoric scale, Gutter-Jaws keeps the population of lesser dinosaurs and giant amphibians in check. It eats once every few weeks, consuming entire hippos or hadrosaurs in a single sitting.

Lair

The Blood Shallows, a murky, crimson-tinted delta where the iron-rich soil turns the water the color of rusted blood.

Habitat
Swamps, Rivers, Mangroves

Signs that it is near

Colossal drag marks in the mud
Bubbles rising from 'submerged logs'
The absence of birdsong near the water
Chalice-sized teeth embedded in the hulls of wrecked boats

Tags

Apex Predator,
Aquatic,
Ambush Hunter

Lore

Folklore tells of a river god that took the form of a crocodile to punish a greedy king who dumped his gold into the swamp. In reality, Gutter-Jaws is simply a relic of a bygone era, a living fossil that survived through sheer size and brutality. Adventurers have died trying to 'scavenge' the mossy log in the center of the shallows, only to realize the log has teeth.

What drives it

Territorial defense and the protection of its 'den' (which happens to contain a treasure chest it finds comfortable to rest its head upon).

After the fight

Once Gutter-Jaws is slain, the Blood Shallows become significantly safer, but the ecosystem shifts as smaller, more aggressive predators (like Giant Toads and Snakes) move in to fill the vacuum. The 'blood' in the water clears slightly, revealing the depth of the barge wreckage.

“In reality, Gutter-Jaws is simply a relic of a bygone era, a living fossil that survived through sheer size and brutality.”
From its lore

Variants

Blighted Gutter-Jaws: Resistant to necrotic damage, deals poison damage with its bite.
Albino Gutter-Jaws: Found in underground rivers, has Sunlight Sensitivity but higher blindsight.

Hooks

Plot hooks

A merchant's guild offers a reward for the recovery of a ledger inside a sunken chest in the Blood Shallows.
The local swamp-folk worship Gutter-Jaws and demand the players stop trespassing in 'His' waters.
A sudden flood has pushed Gutter-Jaws closer to a village's docks, and it has already eaten three fisherman.

How to use it

Apex Predator encounter
Swamp Hazard
Guardian of a sunken objective

Treasure

The sunken chest (2,500 gp)
Ancient fossils embedded in the riverbed near its lair (worth 500 gp to a scholar)
Gutter-Jaws' hide can be crafted into +1 Scale Mail or a Cloak of the Manta Ray.

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