Conjure Nether Lich

You call forth a servant of the Shadowfell. Choose an area of shadow, blight, bones, or corpses that fills a 10-foot cube within range. An ethereal lich of challenge rating 9 appropriate to the area you chose appears in an unoccupied space within 10 feet of it. For example, the lich emerges from the corner of your eye, and a lich rises up from the blighted ground. The lich disappears when it drops to 0 hit points or when the spell ends.
The lich is friendly to you and your companions for the duration. Roll initiative for the lich, which has its own turns. It obeys any verbal commands that you issue to it (no action required by you). If you don't issue any commands to the lich, it defends itself from hostile creatures but otherwise takes no actions.
If your concentration is broken, the nether lich doesn't disappear. Instead, you lose control of the lich, it becomes hostile toward you and your companions, and it might attack. An uncontrolled lich can't be dismissed by you, and it disappears 1 hour after you summoned it. The GM has the nether lich's statistics.