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Slick-Shell Scavenger

Sailors speak of the 'Living Junk-Heaps' of the Sluice. They aren't just animals: they are a physical manifestation of the coast's urban decay. A Slick-Shell Scavenger's armor can often tell the story of the last vessel that sank nearby.

Monsters
Medium monstrosity · Medium · Uncommon

Slick-Shell Scavenger

Armored humanoid crabs fused with maritime refuse and pirate equipment.
AC18
HP45/45
CRMedium
Init
STR
DEX
CON
INT
WIS
CHA
ConditionsNone

Combat

AC 18 · HP 45 · Medium

Slick-Shell Scavenger

Medium monstrosity (aquatic), unaligned
Armor Class18 (Salvaged Plate)
Hit Points45 (6d8 + 18)
Speed
30 ft.,
Swim 30 ft.
STR
DEX
CON
INT
WIS
CHA
Saving ThrowsStrengthConstitution
SkillsAthleticsStealthPerception
Damage Resistances
Poison,
Slashing
Immunities
None
Weaknesses
Lightning
Senses
Blindsight 30 ft.,
Darkvision 60 ft.,
Passive Perception 12
Languages
Understands Aquan but cannot speak
ChallengeMedium
Proficiency Bonus+2
Amphibious. The scavenger can breathe air and water.
Grease-Slicked Hull. The scavenger has advantage on ability checks and saving throws made to escape a grapple. It is unaffected by the difficult terrain created by its own Oil Spray.
Rusted Thorns. A creature that hits the scavenger with a melee attack while within 5 feet of it takes 2 () piercing damage from the jagged metal shards protruding from its shell.

Actions

Multiattack. The scavenger makes two attacks: one with its Heavy Pincer and one with its Salvaged Cutlass.
Heavy Pincer. Melee Weapon Attack: to hit, reach 5 ft., one target. Hit: 10 () bludgeoning damage. If the target is a Medium or smaller creature, it is grappled (escape ). Until this grapple ends, the scavenger cannot use this pincer on another target.
Salvaged Cutlass. Melee Weapon Attack: to hit, reach 5 ft., one target. Hit: 6 () slashing damage plus 3 () poison damage from the rust.
Oil Spray (Recharge 5:6). The scavenger exhales a 15-foot cone of slippery black oil. Each creature in that area must succeed on a Dexterity saving throw or fall prone. The area becomes difficult terrain for 1 minute. A creature that enters the area or ends its turn there must succeed on a Dexterity saving throw or fall prone.

Reactions

Shell Tuck. When the scavenger is hit by a ranged weapon attack, it can use its reaction to gain a bonus to AC against that attack as it retreats into its iron shell.
Role
Tank / Area Control
Built for
4

Gear

  • Fused Plate Armor (Armor, Non-removable)Rusted segments of plate mail hammered and fused into a biological shell.
  • Rusted Cutlass (Weapon, 15 gp)A pitted, barnacle-encrusted blade welded to a chitinous limb.

Feats

Tough
Grappler

Augmentations

Mechanical Shell Integration

Notes for the game master

High AC makes them difficult for low-level players to hit without advantage.
The Oil Spray creates significant tactical hazards in narrow corridors.

Tactics

  1. Opening

    One scavenger uses Oil Spray to coat the floor of the tunnel while others remain submerged or hidden behind debris.

  2. Mid-fight

    Scavengers attempt to grapple prone targets and drag them into deeper water or further into the grease patches.

  3. End of the fight

    Once a target is downed, the scavengers focus on dragging the body away rather than finishing off the rest of the party.

  4. Retreat

    If reduced to 10 hit points or fewer, a scavenger will dive into the deepest water available and use Shell Tuck to survive its escape.

How it fights

Focus on bottlenecks to maximize Oil Spray efficiency.
Use Rusted Thorns to discourage glass-cannon melee fighters.
Collaborate to pin a single target while others maintain the grease slicks.

Who it attacks first

Characters wearing heavy metal armor (seen as shell upgrades)
Characters currently knocked prone
Small characters who can be easily dragged

Works well with

Ooze monsters (like Gray Oozes) that hide within the oil slicks.
Ranged attackers that benefit from the scavengers keeping targets prone.

How to beat it

Fire damage can ignite the Oil Spray (causing 2d6 fire damage to everyone in it but clearing the grease).
Lightning damage jumps through the metal shells, dealing extra damage or forcing a stun.

Ways to avoid a fight

Distract them by tossing high-quality steel or shiny metal objects away from the path.
Use Animal Handling (at disadvantage) to offer them 'replacement shells' like shields or helmets.

Ecology

A hunched, four-legged crustacean with two massive, asymmetrical pincers. Its upper carapace is not purely biological: it has grown into and around pieces of rusted plate armor, barrel hoops, and jagged iron scraps. Its body is perpetually coated in a thick, shimmering black grease that smells of stagnant brine and lamp oil.

Behavior

Slick-Shell Scavengers are ambush predators that lurk just beneath the surface of oily water. They are territorial and obsessed with shiny or metallic objects, often dragging armored victims into the depths to harvest their 'shells' for future growth.

How it lives

These creatures were once simple crabs that mutated after generations of exposure to alchemical runoff and industrial waste in the seaside sluices. They require metal to strengthen their shells, essentially 'smithing' themselves by molting into discarded gear.

Lair

A damp, lightless chamber within the Sluice filled with rusted metal scraps and the bones of sailors. The floor is covered in a permanent six-inch layer of slippery, brackish sludge.

Habitat
Coastal ruins, flooded sewer systems (The Sluice), shipwreck interiors, and grimy seaside caves.

Signs that it is near

Rainbow-colored oil slicks on the water surface
Claw marks gouged into iron pipes
The rhythmic sound of metal scraping against stone
Discarded, rusted pincer-molts fused with old breastplates

Tags

Scavenger,
Crustacean,
Armored

Lore

Sailors speak of the 'Living Junk-Heaps' of the Sluice. They aren't just animals: they are a physical manifestation of the coast's urban decay. A Slick-Shell Scavenger's armor can often tell the story of the last vessel that sank nearby.

What drives it

To expand their armored shells and protect their salvage piles.

After the fight

The area remains slippery for hours, and the smell of the black oil lingers on the characters' gear until it is professionally cleaned.

“They aren't just animals: they are a physical manifestation of the coast's urban decay.”
From its lore

Variants

Deep-Diver Scavenger (adds 60ft swim speed and Pressure Immunity)
Barnacle-Back (adds higher AC but lower movement speed)

Hooks

Plot hooks

The city's sewer system is backing up because these creatures are 'renovating' a pipe with stolen harbor chains.
A legendary pirate's lost cutlass was seen fused to the arm of a particularly large scavenger.
A local smith wants the 'oil-tempered' chitin from a Slick-Shell to craft unique aquatic armor.

How to use it

A pack of 3 blocking a flooded drainage pipe.
A pair guarding a submerged treasure chest in a ruined sea tower.
A group of 5 surrounding the party after a successful Oil Spray ambush in a dark alley.

Treasure

2d10 gold pieces in various water-logged coins
1d4 tarnished silver trinkets
A rusted but functional set of Thieves Tools

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