Baby False Hydra

Hold Breath. The hydra can hold its breath for 1 hour.

 Multiple Heads. Whenever the hydra takes 6 or more damage in a single turn, one of its heads dies. If all its heads die, the hydra dies.

At the end of its turn, it grows two heads for each of its heads that died since its last turn, unless it has taken fire damage since its last turn. The hydra regains 3 hit points for each head regrown in this way.

Reactive Heads. For each head the hydra has beyond one, it gets an extra reaction that can be used only for opportunity attacks.

Wakeful. While the hydra sleeps, at least one of its heads is awake.. However 1 is always asleep at any given time.

Forget me not: the baby False Hydra has the ability to remove any memory of a creature it eats. The creature must be of size small or lower to be devoured in this way

Multi-attack. The baby hydra can make as many bite attacks equal to half the number of heads. 

Action Melee Attack. Melee Weapon Attack: +2 to hit, reach 10 ft., 1 target. Hit: 4 (1d4)  [piercing] damage. 

Enter the description for how bonus actions work for your monster here.

Reaction Name. Enter the description for your action.