Conjure Undead

You call forth an undead servant. You shape the organic matter into an undead of challenge rating 5 or lower  you chose appears in an unoccupied space within 10 feet of it. The Undead dies when it drops to 0 hit points or when the spell ends.

The undead is friendly to you and your companions for the duration. Roll initiative for the undead, 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 undead, it defends itself from hostile creatures but otherwise takes no actions.

If your concentration is broken, the undead doesn't disappear. Instead, you lose control of the undead, it becomes hostile toward you and your companions, and it might attack. An uncontrolled undead can't be dismissed by you, and it disappears 1 hour after you summoned it.

The GM has the undead's statistics. 

At Higher Levels. When you cast this spell using a spell slot of 6th level or higher, the challenge rating increases by 1 for each slot level above 5th.