Undead Fortitude. If damage reduces the undead draft horse to 0 hit points, it must make a Constitution saving throw with a DC of 5 + the damage taken, unless the damage is radiant or from a critical hit. On a success, the undead draft horse drops to 1 hit point instead.

Mindless Gallop. Once the undead draft horse perceives a living creature, it gains +5ft to its speed and expends all its move actions to reach the nearest perceived living creature.

Hooves. Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 9 (2d4 + 4) bludgeoning damage.

Infected Bite. Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 9 (2d4 + 4) piercing damage. On a successful hit, the target must throw a Constitution saving throw. On a failed save, the target is poisoned. After each hour after the first bite, the target must roll another Constitution saving throw. On a fail, the target will become undead and lose control over their body. The poison ends after 3 consecutive successes. The poison may also be cured by spells such as Remove Curse or Lesser Restoration.