Cocaine Zombie - Grouper

Undead Fortitude. If damage reduces the zombie to 0 hit points, it must make a Constitution saving throw with a DC of 5 + the damage taken, unless the damage is radiant or from a critical hit. On a success, the zombie drops to 1 hit point instead.

This creature releases puffs of cocaine constantly. Any creature within 5 feet of the Cocaine Zombie must succeed on a DC 12 Constitution saving throw or be infected with the Cocaine Plague. Those infected with the Cocaine Plague lose 5 - their constitution modifier of their maximum health every hour. They can retry the saving throw at the end of every hour. A creature reduced to zero hitpoints by this effect dies and is turned into a Cocaine Zombie - Grouper.

Slam. Melee Weapon Attack: +3 to hit, reach 5 ft., one target. Hit: 4 (1d4 + 2) bludgeoning damage.

Bite. Melee Weapon Attack: +3 to hit, reach 5 ft., one target. Hit: 4 (1d6 + 1) piercing damage, and the target must succeed on a DC 14 constitution saving throw or be infected with the Cocaine Plague.