Colo Claw Fish

Bioluminescence. The colo claw fish emits dim light in a 15-foot radius around it.

Water Breathing. The colo claw fish can breathe only underwater.

Multiattack. The colo claw fish can use its hydrosonic shriek. It makes three attacks: one with its bite and two with its claws.

Bite. Melee Weapon Attack: +13 to hit, reach 10 ft., one target. Hit: 32 (4d12 + 6) piercing damage. If the target is a creature, it is stunned for one minute. 

Claw. Melee Weapon Attack: +13 to hit, reach 15ft., one target. Hit: 24 (4d8 + 6) slashing damage.

Hydrosonic Shriek. The colo claw fish emits a strange, barely audible shriek in a 30 ft. cone. Each creature in the cone must make a DC 20 Constitution saving throw, taking 26 (4d12) thunder damage on a failed save, and half as much damage on a successful one. Each creature in the cone is also stunned for one minute.

Swallow. The colo claw fish makes one bite attack against a Huge or smaller creature it is grappling. If the attack hits, the target takes the bite's damage, the target is swallowed, and the grapple ends. While swallowed, the creature is blinded and restrained, it has total cover against attacks and other effects outside the colo claw fish, and it takes 42 (12d6) acid damage at the start of each of the colo claw fish’s turns.