Cohozuna

Amphibious: Cohozuna can breathe air and water.

Legendary Resistance (3/Day): If Cohozuna fails a saving throw, it can choose to succeed instead.

Multiattack: Cohozuna makes four melee attacks.

Slam: Melee Weapon Attack: +15 to hit, reach 15ft, one target. Hit: 41 (6d10 + 8) bludgeoning damage.

Jump Slam (Recharge 5-6): Cohozuna jumps up to 100 feet in the air and lands on the ground in an unoccupied space within 30 feet of where it first jumped. Cohozuna takes no damage from the fall, and each creature within 30 feet of where it lands must make a DC 22 Strength saving throw. On a failed save, the creature takes 35 (10d6) bludgeoning damage and is knocked prone. On a successful save, a creature takes half as much damage and isn’t knocked prone. If a creature is in Cohozuna’s space when it lands, then that creature automatically fails the saving throw and is pushed to an unoccupied space within 5 feet of Cohozuna.

Cohozuna can take three legendary actions choosing from this list, but only at the end of another creature’s turn. It regains spent legendary actions at the start of each of its turns.

Detect: Cohozuna makes a Wisdom (Perception) check.

Jump Slam (Costs 2 actions): Cohozuna recharges and then uses Jump Slam.