Echolocation. The whale can't use its blindsight while deafened.

Hold Breath. The whale can hold its breath for 30 minutes.

Keen Hearing. The whale has advantage on Wisdom (Perception) checks that rely on hearing.

Bite. Melee Weapon Attack: +4, to hit, reach 5 ft., one target. Hit: 15 (3d6 + 4) piercing damage.If the target is medium or smaller, it must succeed a DC 15 Strength saving throw or be swallowed by the whale. A swallowed creature is restrained and blinded and has total cover against attacks and other effects outside the whale and takes 4(1d6 acid damage) + 4(1d6 bludgeoning) + 7(2d6 cold damage) damage at the start of each of the whale's turns. If the whale takes damage, it must succeed a Constitution saving throw with a DC equal to half the damage dealt by the swallowed creature(minimum 10.) On afailed saving throw, the whale regurgitates all swallowed creatures which fall prone in a space within 10ft. of the whale. If the whale dies, a swallowed creature can escape from the corpse by using 15ft of movement exiting prone.

Tail. Melee Weapon Attack: +8 to hit:, 7ft., one target. Hit 19(2d12+6) bludgeoning damage. If the target is a creature, it must succeed a DC 15 Constitutions saving throw or become stunned until the end of its next tum.

 Cold Breath (Recharge 5–6). The whale exhales an icy blast in a 60-foot cone. Each creature in that area must make a DC 15 Constitution saving throw, taking 39(7d10)cold damage on a failed save, or half as much damage on a successful one.