You can use an action on each of your turns to change the effect of the aura. This aura ends early if you are unconscious, fall to 0 hit points, or end it as a bonus action. While this area is active, you have disadvantage in any Stealth check attempting to hide from undead creatures.

Bonethrall

Beginning at 6th level, you can attempt to take certain degree of control of an undead creature that is under the influence of your Aura of Desecration. As an action, choose an undead creature that is within the area of your Aura of Desecration. That creature must make a Charisma saving throw against your warlock spell save DC, becoming immune to this effect for 24 hours if they succeed. If it fails, and the creature has an Intelligence of 8 or more, it perceives your words and actions favorably (treat its attitude as friendly). It will not attack you while this effect last. You can give the controlled creature orders, but you must win an opposed Charisma check to convince it to do anything it wouldn’t ordinarily do. Retries are not allowed. An intelligent controlled undead never obeys suicidal or obviously harmful orders, but it might be convinced that something very dangerous is worth doing. An intelligent undead can repeat the saving throw at the end of each of its turns.

An undead creature which has an Intelligence of 7 or less can only follow basic commands, such as “come here,” “go there,” “fight,” “stand still,” and so on. It won’t resist suicidal or obviously harmful orders.

Any act by you or your allies that threatens the controlled undead (regardless of its Intelligence) ends the effect. Your commands are not telepathic, the undead creature must be able to hear you. This effect last for 1 minute, until you fall unconscious, drop to 0 hit points, or die. Once you use this feature, you can’t use it again until you finish a long rest.