5e SRD >Creatures >

Slither Kelp

Large ooze, unaligned

Armor Class 8
Hit Points 42 (5d10 + 15)
Speed 20 ft., climb 20 ft., swim 40 ft.

Str Dex Con Int Wis Cha
17 (+3) 6 (-2) 16 (+3) 1 (-5) 5 (-3) 1 (-5)

Damage Vulnerabilities fire
Damage Immunities acid, poison, psychic, slashing
Condition Immunities blinded, charmed, deafened, exhaustion, frightened, poisoned, prone
Senses blindsight 60 ft. (blind beyond this radius), passive Perception 7
Challenge 1 (200 XP)

Special Traits

  • Amorphous. The slither kelp can move through a space as narrow as 1 inch wide without squeezing.
  • False Appearance. While the slither kelp remains motionless, it is indistinguishable from a mound of kelp.
  • Spider Climb. The slither kelp can climb difficult surfaces, including upside down on ceilings, without needing to make an ability check.


  • Pseudopod. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 10 (2d6 + 3) bludgeoning damage. The target is also grappled (escape DC 12). Until the grapple ends, the target is restrained and has disadvantage on Strength checks and saving throws. The slither kelp can grapple up to three Medium or smaller targets.


Living on the piers at the docks is a dangerous ooze from the ocean. Slither kelp slides out of the sea and hunts for food on land. It’s easy for the ooze to hide on the beach, on and around piers, in the fog, or amongst foul mounds of garbage. Like other oozes, these creatures prefer the dark. They are mindless predators that seek out living organisms to feed on.

From the Deep. These bizarre creatures are from the deepest part of the sea. They will return every once in awhile to their home and move easily in the water.

Drag Back into the Ocean. The slither kelp usually drags victims back into the ocean. Once there, the kelp and other sea creatures will eat their prey. The remains of victims will wash up back days or weeks later.

Ooze Nature. An ooze doesn’t require sleep.

Section 15: Copyright Notice

Monsters of the City Sins and Virtues A Collection of Monsters for 5th Edition © 2020 Cawood Publishing. Author: Andrew Cawood