Animate Steed

This spell creates an undead servant. Choose a pile of bones or a corpse of a Medium or Large Beast within range. Your spell imbues the target with a foul mimicry of life, raising it as an undead creature. The target becomes a skeleton if you have a large pile of bones or zombie if you chose a corpse of warhorse, a pony, a camel, an elk, or a mastiff. (Your GM might allow other animals to be animate as undead steeds.) The steed is undead instead of its normal type (the GM has the creature's game statistics). The "Dungeon Master Guild" page 282 has the needed information for making a skeletal or zombified creature.

Your steed serves you as a mount, both in combat and out, and you have an instinctive bond with it that allows you to fight as a seamless unit. While mounted on your steed, you can make any spell you cast that targets only you also target your steed.

On each of your turns, you can use a bonus action to mentally command any creature you made with this spell if the creature is within 60 feet of you (if you control multiple creatures, you can command any or all of them at the same time, issuing the same command to each one). You decide what action the creature will take and where it will move during its next turn, or you can issue a general command, such as to guard a particular chamber or corridor. If you issue no commands, the creature only defends itself against hostile creatures. Once given an order, the creature continues to follow it until its task is complete.

The creature is under your control for 24 hours, after which it stops obeying any command you've given it. To maintain control of the creature for another 24 hours, you must cast this spell on the creature again before the current 24-hour period ends. This use of the spell reasserts your control over up to four creatures you have animated with this spell, rather than animating a new one.

This spell is affected by class abilities like school of necromancy "Undead Thralls" allowing for more undead steeds to be created at a time.