5e SRD:Giant Crab
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Medium beast, unaligned
Amphibious. The crab can breathe air and water.
Claw. Melee Weapon Attack: +3 to hit, reach 5 ft., one target. Hit: 4 (1d6 + 1) bludgeoning damage, and the target is grappled (escape DC 11). The crab has two claws, each of which can grapple only one target.