Beast of the Sea

The beast can breathe both air and water.

You can add your proficiency bonus to any ability check or saving throw it makes.

Melee Weapon Attack: PB + your Intelligence modifier to hit, reach 5 ft., one target. Hit: 1d8 + 2 + PB piercing or bludgeoning damage (your choice), and the target is grappled (escape DC equals your bestiary save DC). Until this grapple ends, the beast can't use this attack on another target.