Warhorse

If the Warhorse moves at least 20 feet straight toward a creature and then hits it with a hooves attack on the same turn, that target must succeed on a saving throw or be knocked prone. If the target is prone, the Warhorse can make another attack with its hooves against it as a bonus action.

+6 to hit, range 5 ft. Hit: 11 (2d6 + 4) bludgeoning damage.