Charge. If the Abyssal Goat at least 30 feet straight toward a target and then hits it with a Headbutt attack on the same turn, the target takes an extra 12 (2d12) bludgioning damage. If the target is a creature, it must succeed on a DC 17 Strength saving throw or be pushed up to 20 feet away and knocked Prone The Abyssal Goat must also make the save or become Prone until the start of it's next turn.

Fleet of Foot. The Abyssal Goat can move normally on difficult terrain.

Back Kick.  The Abyssal Goat makes one free attack with kick at the start of it's turn,  if there is an engaged creatrure is directly behind it.

Multiattack. The Abyssal Goat makes two attacks: one kick and one headbutt. 

Headbutt. Melee Weapon Attack: +8 to hit, reach  5ft., one target. Hit: 13 (1d12 + 4) bludgeoning damage. 

Kick.  The Abyssal Goat uses it's hoof to stomp at an enemy. Melee Weapon Attack: +8 to hit, reach 5 ft., one target. Hit: 7 (2d6 + 4) bludgeoning damage.

True Omnivore (Recharge 6). The Abyssal Goat targets a creature equipped with a weapon, or sheild that is not magical. The creature with the targeting item equipped must make a DC 18 Strength saving throw, or the item is destroyed, on a save the creature is disarmed, and the item knocked to the ground in the closest adjacent free space.

Underbite.  When Attacked by a creature while Prone  The Prone Abyssal Goal scrambles 15 Feet towards the attacking creature, undermaw masticating, if this movement collides with a creature, the goat attempts to consume it with it's undermaw. Each creature in that area must make a DC 18 Dexterity saving throw, taking 20 (5d8) bludgeoning damage on a failed save, or half as much damage on a successful one.