Black Bill

Aggressive. As a bonus action, Bill can move up to his speed toward a hostile creature that he can see.
Hexblade's Curse (Regenerates after a Short or Long Rest). As a bonus action, Bill places a baleful curse on one creature he can see within 30 feet. The target is cursed for 1 minute. Until the curse ends, Bill gains the following benefits:

• Damage rolls against the cursed target deal an additional 4 (1d10) necrotic damage. 
• Any attack roll Bill makes against the cursed target Is a critical hit on a roll of 19 or 20 on the d20

Magic Resistance. Bill has an advantage on saving throws against spells and other magical effects

Pact Weapon. Bill has a +2 bonus to attack and damage rolls he makes with his Stone Creataxe, and such attacks are magical

Multiattack. Bill makes three melee attacks: two with his hooves and one with his stone greataxe.

Hooves. Melee Weapon Attack: + 5 to hit, reach 5 ft, one target Hit: 10 (1d10+5) bludgeoning damage. If the target is a creature, it must succeed on a DC 13 Strength saving throw or be knocked prone.

Stone Greataxe. Melee Weapon Attack: +6 to hit, reach 5 ft, one target. Hit: 10 (1d12 + 4) bludgeoning damage.

Bill can take 3 legendary actions, choosing from the options below. Only one legendary action option cart be used at a time, and only at the end of another creature's turn. Bill regains spent legendary actions at the start of his turn.

Move. Bill moves up to his speed without provoking opportunity attacks.
Attack. (Costs 2 Actions) Bill makes one attack.