Aku'Tal

Aku'Tal can hold its breath for 1 hour.

Aku'Tal has five heads. Whenever Aku'Tal takes 25 damage or more on a single turn, one of its heads dies. Aku'Tal dies if all its heads are dead. At the end of each of its turns when it has at least one living head, Aku'Tal grows two heads for each of its heads that died since its last turn, unless it has taken Fire damage since its last turn. Aku'Tal regains 20 Hit Points when it grows new heads.

For each head Aku'Tal has beyond one, it gets an extra Reaction that can be used only for Opportunity Attacks.

Each head functions independently, rolling its own initiative and capable of moving up to 10 feet in the water during their turn. Aku'Tal otherwise functions as normal: each head can make only one Attack and all heads share the same pool of Hit Points.

Aku'Tal makes as many Bite attacks as it has heads.

Melee Attack Roll: +8, reach 10 ft. Hit: 10 (1d10 + 5) Piercing damage.

A head of Aku'Tal can replace its bite Attack with a casting of the spell Sacred Flame (DC 16) 2d8 Radiant damage.