Echolocation. The bake-kujira can’t use its blindsight while deafened.

Keen Hearing. The bake-kujira has advantage on Wisdom (Perception) checks that rely on hearing.

Leviathan’s Wail. As a bonus action a bake-kujira can sing a haunting tune. Living creatures within a 120 feet must succeed at a DC 18 Charisma saving throw or gain the charmed or frightened condition (decided by the bake-kujira when it sings) until the end of the bake-kujira’s next turn.

Pain Threshold. Any attacks or spells that deal 10 points of damage or less do not deal any damage to the bake-kujira.

Undead Parasites. A 30-foot radius cloud of undead fish and sea birds surrounds a bake-kujira. Creatures starting their turn within the cloud must succeed at a DC 15 Wisdom save or take 21 (6d6) necrotic damage and gain the poisoned condition until the beginning of their next turn.

Multiattack. The bake-kujira makes one bite and one tail slam attack.

Bite. Melee Weapon Attack: +15 to hit, reach 20 ft., one target. Hit: 115 (10d20+10) piercing damage.

Tail Slap. Melee Weapon Attack: +15 to hit, reach 25 ft., one target. Hit: 65 (10d10+10) bludgeoning damage.

Resonating Song (Recharge 4–6). The bake-kujira lets loose a powerful song in a 60-foot cone. Each creature in that cone must make a DC 18 Constitution saving throw, taking 90 (20d8) thunder damage on a failed save, or half as much damage on a successful one. Any creature that takes 50 or more damage from the bake-kujira’s resonating song gains the deafened condition.