Mammoth

Trampling Charge. If the mammoth 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 18 Strength saving throw or be knocked prone. If the target is prone, the mammoth can make one stomp attack against it as a bonus action.

Actions

Gore. Melee Weapon Attack: +10 to hit, reach 10 ft., one target. Hit: 25 (4d8 + 7) piercing damage.

Stomp. Melee Weapon Attack: +10 to hit, reach 5 ft., one prone creature. Hit: 29 (4d10 + 7) bludgeoning damage. A mammoth is an elephantine creature with thick fur and long tusks. Stockier and fiercer than normal elephants, mammoths inhabit a wide range of climes, from subarctic to subtropical.

Actions

Multiattack. The mammoth makes two Gore attacks.

Gore. Melee Attack Roll: +10, reach 10 ft. Hit: 18 (2d10 + 7) Piercing damage. If the target is a Huge or smaller creature and the mammoth moved 20+ feet straight toward it immediately before the hit, the target has the Prone condition.

Bonus Actions

Trample. Dexterity Saving Throw: DC 18, one creature within 5 feet that has the Prone condition. Failure: 29 (4d10 + 7) Bludgeoning damage. Success: Half damage.