Touch of Thanatos

Target you hit takes 1d6 Necrotic damage. If this kills the target, the target immediately becomes your undead summon. (With certain exceptions as your GM sees fit.)

You can only have one summon active at a time using this spell. You can control the summon via thought. The summon will disappear permanently once it dies but will not disappear before this. The summon has health, armor class, weapons, and skills, based on the creature and equipment your summon had before its death.