You give a verbal command to a spectral creature that you can see or sense within range, ordering it to carry out some service or refrain from an action or a course of activity as you decide. The target must succeed on a Charisma saving throw or have the Charmed condition for the duration. 

While Charmed, the creature takes 8d10 Psychic damage if it acts in a manner directly counter to your command. It takes this damage no more than once each day. The possessed spirit or wraith can attempt to break free of control at the end of it's turn (one full turn while being controlled must occur prior to the reroll).

You can issue any command you choose, short of an activity that would result in certain death. Should you issue a suicidal command, the spell ends.

A Remove Curse,Greater Restoration, or Wish spell ends this spell.

Using a Higher-Level Spell Slot. If you use a level 7 or 8 spell slot, the duration is 365 days. If you use a level 9 spell slot, the spell lasts until it is ended by one of the spells mentioned above.