Monstrous Crayfish

Large beast, unaligned

Armor Class 14 (natural armor)
Hit Points 30 (4d10 + 8)
Speed 20 ft., swim 40 ft.

16 (+3) 10 (+0) 14 (+2) 1 (-5) 10 (+0) 2 (-5)

Condition Immunities frightened
Senses darkvision 60 ft., passive Perception 10
Challenge 2 (450 XP)


  • Water Dependency. A monstrous crayfish can survive out of water for seven hours. After this limit, a monstrous crayfish begins suffocating.


  • Multiattack. A monstrous crayfish makes two attacks.
  • Pincer. Melee Weapon Attack: +5 to hit, reach 5 ft., one creature. Hit: 7 (1d8 + 3) slashing damage and the target is grappled (escape DC 15).
  • Crush. The monstrous crayfish crushes one creature that it has grappled. The target takes 7 (1d8 + 3) piercing damage.


A giant crayfish looks like a giant lobster with a sharp snout and eyes on movable, flickering stalks. Two large claws extend from its thorax in front of four smaller pairs of spindly walking legs. Its exoskeleton is dark brown.

Monstrous crayfish are freshwater creatures that dwell on the bottoms of seas, lakes, ponds, and other shallow water. They are predators and scavengers that exist on a diet of decaying flesh from dead fish, algae, snails, worms, and other animals, including swimmers who venture too close to the monstrous crayfish’s lair.

These giant crayfish make their homes under rocks or in underwater tunnels that they dig. Their flooded tunnels extend over long distances and always include a “chimney” through which the monstrous crayfish can enter and exit its home via dry ground. These exits have been found as far as 100 feet inland from the lake shore or riverbank.

Section 15: Copyright Notice

Tome of Horrors 2020, (C) 2020, Necromancer Games

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