Voice of the Undead

You let out a deep and booming voice, so loud that it could wake the dead. Each undead within the area of this spell must succeed on a Charisma saving throw or become charmed by you, allowing you to command it to act on your behalf.

On each of your turns, you can use a bonus action to mentally command any creature charmed by this spell if the creature is within 120 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.

Undead with a CR 3 or greater can repeat this saving throw once every 24 hours, ending the charmed condition on a successful save.