Animate Undying

This spell creates an (relatively) intelligent , armed and armored undead servant. Sacrifice four Skeleton or Zombie's you have raised. Your spell imbues the target with righteous undead fury. The target becomes a Undying Soldier (the game statistics are in Eberron: Rising from the Last War).

If given an order the Undying Soldier is capable of completing a task and stopping to attack an enemy without direct guidance. If you issue no commands, the creature will defends itself against hostile creatures. 

The creature is under your control for 24 hours, after which it stops obeying any command you've given it. To maintain control of the creature for another 24 hours, you must cast this spell on the creature again before the current 24-hour period ends. You can control multiple creatures with this spell, but only if cast at higher levels. For every 2 slots above 4th you may animate an additional Undying Solider (for a maximum of 4 if cast at 9th level).

At Higher Levels. When you cast this spell using a spell slot of 6th level or higher, you may animate or reassert control over an additional Undying Soldier, this goes up to three creates at 8th level and 4 creatures at 9th level. Four animated or created undead creates you have control over must be sacrificed for the creation of an Undying Soldier and each of the creatures must come from a different corpse or pile of bones.