Multiattack

Three melee attacks. If grappling two creatures it can't make Crustaceous Sword attacks.

Crustaceous Sword

Melee Weapon Attack: +7 to hit, 5 ft., one target, 13 (2d8+4) slashing damage.

Claw

Melee Weapon Attack: +7 to hit, 5 ft., one target, 11 (2d6+4) bludgeoning damage. If the target is Med or smaller it is grappled (escape DC 15) and the crab can't use this claw to attack another target. The crab has two claws each of which can grapple only one target.