Auchindoun Chimera

Multiple Heads. The chimera has three heads, one lion, one goat, and one snake. Anytime the chimera loses 75 hit points, one of it's heads is destroyed. First the snake head, then the goat. Should the chimera be healed back above the 75 hit point threshold, the snake head will regrow. The goat head cannot be restored. So long as more than one head remains alive, the chimera also gains advantage on all WIS Perception checks, as well as advantage on saving throws against being blinded, deafened, or knocked unconscious.

Multiattack. The chimera makes three attacks: two attacks with it's heads, and one with it's claws. If Goatsong is available, the chimera can use it in place of one of it's heads.

Bite. Melee Weapon Attack: +12 to hit, reach 5 ft., one target. Hit: 20 (4d6 + 8) piercing damage. 

Claws. Melee Weapon Attack: +12 to hit, reach 5 ft., one target. Hit: 14 (2d6 + 8) slashing damage. 

Snake Bite. Melee Weapon Attack: +12 to hit, reach 10 ft., one target. Hit: 11 (2d6 + 4) piercing damage. The target must also make a (DC 16) Constitution saving throw or receive an additional 14 (4d6) poison damage and become poisoned for the next hour.

Acid Spray. RangedWeapon Attack: +12 to hit, range 30 ft., one target. Hit: 15 (2d6 + 8) acid damage.

Goatsong. (Recharge 5-6). The goat head bleats out a mournful song, healing the chimera for 36 (8d6+8) hit points.