Undead Warhorse

Trampling Charge. If the horse 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 DC 14 Strength saving throw or be knocked prone. If the target is prone, the horse can make another attack with its hooves against it as a bonus action.

Undead nature. The horse doesnt need air, water or food to survive.

Frightning presence. Any enemy of the horse within 30 ft of it must succeed a DC 17 wis save or become frightened. If you succeed the saving throw then you become immunity to the horse's frightened presence for 1 day. 

Hooves. Melee Weapon Attack: +9 to hit, reach 5 ft., one target. Hit: 15 (3d6 + 4) bludgeoning damage and 7 (1d6 + 4) necrotic damage. 

Rotting bite. Melee Weapon Attack:+9 to hit, reach 5 ft., one target. Hit: 11 (2d8 + 2) piercing damage and the target must succeed a DC 17 con save or be poisoned for 1 hour.