Billy Gruff

Charge. If the giant goat moves at least 20 feet straight toward a target and then hits it with a ram attack on the same turn, the target takes an extra 2 (1d4) bludgeoning damage. If the target is a creature, it must succeed on a DC 10 Strength saving throw or be knocked prone.

Sure-Footed. The giant goat has advantage on Strength and Dexterity saving throws made against effects that would knock it prone.

Innate Toughness: The creatures hit point maximum increases by 1, and increases by 1 every time it gains a level.

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