Colossal Minotaur Skeleton

Charge. If the Colossal Minotaur Skeleton moves at least 5 feet straight toward a target and then hits it with a gore attack on the same turn, the target takes an extra 20 (3d12) piercing damage. If the target is a creature, it must succeed on a DC 17 Strength saving throw or be pushed up to 10 feet away and knocked prone.

Legendary resistance. Colossal Minotaur Skeleton has 3 

Greataxe. Melee Weapon Attack: +10 to hit, reach 5 ft., one target. Hit: 30 (4d12 + 8) slashing damage.

Gore. Melee Weapon Attack: +10 to hit, reach 5 ft., one target. Hit: 31 (6d8 + 8) piercing damage.

Flame Stare.  The Colossal Minotaur Skeleton stares at a creature they must make a Dex save of 18. On failure they take 17 (3d10) fire damage, or half as much on a successful one.