Ruidium 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 16 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 +10 to hit (with advantage if the target is a creature missing any hit points), reach 10 ft., one target. 25 (4d8 + 7) Piercing damage plus 7 (2d6) Psychic damage.

Melee Weapon Attack +10 to hit, reach 5 ft., one Prone creature. 29 (4d10 + 7) Bludgeoning damage plus 7 (2d6) Psychic damage.