Crabus

Amphibious. The crab can breathe air and water.

Claw. Melee Attack Roll: +7, reach 5 ft. Hit: 4 (2d6 + 4) Bludgeoning damage. If the target is Medium or smaller, it has the Grappled condition (escape DC 11). The crab has two claws, each of which can grapple one target.

Slam. Melee Attack Roll: +7, reach 5 ft. Hit: 4 (3d6 + 4) Bludgeoning damage. This attack is only possible when an enemy is grappled and is made with advantage.

Sand Claw. Melee Attack Roll: +7, reach 5 ft. Hit: 4 (2d8 + 4) Bludgeoning damage. This a surprise attack from the Crab attacking from below the sand attacking the closest targets within range. If the target is Medium or smaller, it has the Grappled condition (escape DC 11). The crab has two claws, each of which can grapple one target. If the target is surprised the dc must be made with disadvantage.