Crusty, Crabfisher's Scourge

Amphibious. The crab can breathe air and water.

Spider Climb: The crab may climb on difficult surfaces including ceilings without making an athletics check.

Multiattack: The crab makes two claw attacks.

Claw. Melee Weapon Attack: +9 to hit, reach 5 ft., one target. Hit: 13 (2d8 + 4) bludgeoning damage, and the target is grappled (escape DC 11). The crab has two claws, each of which can grapple only one target.

Bubble Beam (Recharge 5-6): The crab fires a 30 foot long 5 feet wide beam of bubbles. All creatures larger or smaller in the line must make a DC 16 dexterity saving throw or be trapped in a bubble and begin to levitate straight up as if by the spell levitate until they take damage from any source or use an attack action to break the bubble. A levitating creature rises 20 feet up at the start of their turn and cannot control the direction they levitate.

The crab can take 3 legendary actions, choosing from the options below. Only one legendary action option can be used at a time and only at the end of another creature’s turn. The crab regains spent legendary actions at the start of its turn.

Move: the crab moves up to its movement speed.

Claw: The crab makes a claw attack

Carapice Slam: All creatures within 5 feet of the crab must make a DC 16 dexterity saving throw or take 13 (3d8) bludgeoning damage and be pushed 15 feet away from Crusty.