Undead Mount

You animate the corpse of a horse or similar beast or magical beast as a mount. The mount is under your control, and you have advantage on all ability checks related to it. The mount can carry a maximum of 300 pounds, has a speed of 40 feet, AC of 10, and 6 hit points. The mount is unable to attack or do anything other than move under your command. If the rider of the mount is undead, the mount cannot be turned separately; any successful turning attempt against an undead rider also turns the mount. When the spell ends, the mount returns to a normal corpse, though it can be animated again using this spell

At Higher Levels. If you cast this spell using a spell slot of 3rd level or higher, the duration of the spell increases by 48 hours for each slot level above 2nd.