Elephant

If the elephant moves at least 20 feet straight toward a creature and then hits it with a gore attack on the same turn, that target must succeed on a DC 12 Strength saving throw or be knocked Prone. If the target is Prone, the elephant can make one stomp attack against it as a bonus action.

Melee Weapon Attack +8 to hit, reach 5 ft., one target. 19 (3d8 + 6) Piercing damage.

Melee Weapon Attack +8 to hit, reach 5 ft., one Prone creature. 22 (3d10 + 6) Bludgeoning damage.