Cerberus Cat

Keen Sight and Smell. The Cerberus Cat has advantage on Wisdom (Perception) checks that rely on sight and smell.

Pounce. If the Cerberus cat moves at least 20 feet straight toward a creature and then hits it with a claw attack on the same turn, that target must succeed on a DC 13 Strength saving throw or be knocked prone. If the target is prone, the Cerberus cat can make one bite attack against it as a bonus action.

Innate Spellcasting. The Cerberus cat’s innate spellcasting ability is Wisdom (spell save DC 16). The Cerberus cat can innately cast the following spell(s), requiring no material components:

At Will: hellish rebuke

Multiattack. The Cerberus cat can make 3 bite attacks, thanks to its three heads. It can only do this 3 times a day.

Claw. Melee Weapon Attack: +5 to hit, reach 5 ft., 1 target. Hit: 5 (1d8) slashing damage. 

Bite. Melee Weapon Attack: +5 to hit, reach 5 ft., 1 target. Hit: 7 (1d8 + 3) piercing damage + 5 (1d8) fire damage.