Oliphaunt

Trampling Charge. If the oliphaunt 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 oliphaunt can make one stomp attack against it as a bonus action.

Trunk Slam. If the oliphaunt starts its turn with a target grappled, it can slam the target into the ground as a bonus action. The creature must make a DC 17 Constitution saving throw, taking 11 (2d10) bludgeoning damage on a failed save, or half as much damage on a successful one. This doesn't end the grappled condition on the target.

Multiattack. The oliphaunt uses its trunk, then it makes one gore or stomp attack.

Gore. Melee Weapon Attack: +11 to hit, reach 10 ft., one target. Hit: 30 (5d8 + 8) piercing damage.

Stomp. Melee Weapon Attack: +11 to hit, reach 5 ft., one target. Hit: 35 (5d10 + 8) bludgeoning damage.

Trunk. Melee Weapon Attack: +11 to hit, reach 15 ft., one creature. Hit: The target is grappled (escape DC 17) if it is a Large or smaller creature. Until the grapple ends, the target is restrained and the oliphaunt can't use its trunk on another target.

Tusk Sweep (Recharge 5-6). The oliphaunt sweeps its tusks in a wide arc. Each creature in a 20-foot cube must make a DC 17 Dexterity saving throw, taking 35 (10d6) bludgeoning damage on a failed save, or half as much damage on a successful one.