Multiattack. The krasis makes three attacks: one with its bite, one with its claws, and one with its tail.

Bite. Melee Weapon Attack: +11 to hit, reach 10 ft., one creature. Hit: 27 (6d6 + 6) piercing damage.

Claws. Melee Weapon Attack: +11 to hit, reach 10 ft., one target. Hit: 22 (3d10 + 6) slashing damage.

Tail. Melee Weapon Attack: +11 to hit, reach 15 ft., one target. Hit: 33 (6d8 + 6) bludgeoning damage. If the target is a creature, it must succeed on a DC 19 Strength saving throw or be knocked prone.