Bone Crab (Locathah Variant)

Amphibious. The crab can breathe air and water.

Environmental Camouflage. In an environment featuring loose soil or sand, the Bone Crab's Hard Shell ability makes it almost impossible to perceive, appearing more like a small rock, or bone fragment than anything else. If in Coastal, Swamp, desert, or Underwater Environment, Stealth checks are doubled when the Bone Crab is retracted into its shell.

Leviathan Will. You have advantage on saving throws against being charmed, frightened, paralyzed, poisoned, stunned, or put to sleep.

Sharp Claw. Melee Weapon Attack: +0 to hit, reach 5 ft., one target. Hit: 1 slashing damage.

Hard Shell. The Bone Crab can use a bonus action to retract its whole body into the shell, increasing its AC by 4. It can come out of the shell using another bonus action. While inside its shell, the Bone Crab is considered prone, its speed is 5, it cannot take reactions, it has disadvantage on Dexterity saving throws, and the only action it can take is a bonus action to emerge from its shell.