Armor Class 17 (natural armor)
Hit Points 76 (8d12 + 24)
Speed 20 ft., swim 30 ft.
Skills Stealth +2
Senses blindsight 30 ft., passive Perception 10
Languages —
Challenge 5
Amphibious. The crab can breathe air and water.
Shell Camouflage. While the crab remains motionless with its eyestalks and pincers tucked close to its body, it resembles a natural formation or a pile of detritus. A creature within 30 feet of it can discern its true nature with a successful DC 15 Intelligence (Nature) check.
Multiattack. The crab makes two attacks with its claws.
Claw. Melee Weapon Attack: +7 to hit, reach 10 ft., one target. Hit: 20 (3d10 + 4) bludgeoning damage, and the target is grappled (escape DC 15). The crab has two claws, each of which can grapple only one target
SKT, p. 240