Black Phillip

Primal Bond. You can add your proficiency bonus to any ability check or saving throw that Black Phillip makes.

Spellcasting. (Transformed) Black Phillip is a 3rd-level spellcaster. Its spellcasting ability is Wisdom (spell save DC 10 to hit with spell attacks). Black Phillip has the following spells prepared:
Cantrips (at will): produce flame
1st level (2/day): cause fear

Transform:  if either he or Nigh falls to half health he transforms, growing wings and a barbed tail.  this gives him access to his (Transformed) abilities.

Charge. If Black Phillip moves at least 20 feet straight toward a target and then hits it with a Headbutt attack on the same turn, the target takes an extra 1d6 ( 1D8 if Transformed) slashing damage. If the target is a creature, it must succeed on a Strength saving throw against your spell save DC or be knocked prone.

Headbutt. Melee Weapon Attack: +3 to hit, reach 5 ft., one target. Hit:  (1d6 + 4) Bludgeoning damage.

Sting(Transformed). +3 to hit, reach 5 ft., one target. Hit: (1d8+3) piercing damage, and the target must make a DC 15 Constitution saving throw, taking (2d6) poison damage and also become poisoned until the end of your next turn on a failed save, or half as much damage on a successful one.