Dire Mammoth (5e Creature)
From D&D Wiki
Gargantuan beast, unaligned
Trampling Charge. If the mammoth moves at least 30 feet straight toward a creature and then hits it with a gore attack on the same turn, that target must succeed on a DC 21 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.
Gore. Melee Weapon Attack: +13 to hit, reach 15 ft., one target. Hit: 31 (5d8 + 9) piercing damage.
Stomp. Melee Weapon Attack: +13 to hit, reach 10 ft., one prone creature. Hit: 36 (5d10 + 9) bludgeoning damage.
A beast of great enormity, the dire mammoth is easily aggravated. Only found in the farthest north, their thick coats and layers of fat give them the ability to brave said frigid conditions. They often feed on carrion of creatures that have perished in the icy environments. In desperate times they may attack villages to feed on crops, livestock, and the humanoid residents.