Death Mark

You invoke a curse stemming from a creature's own life force, causing a black mark to grow on a creature's body. A creature within eye sight must make a constitution saving throw. On a failed save, the creature takes 1d4 necrotic damage, and becomes cursed. If the creature dies within the next 24 hours an you can see it, you can cause it's soul to tether until the end of it's next turn. You control the creature on its next turn as if it was still conscious. It can move and take actions as normal.  Once you end the creature's turn, it''s soul moves on, and the creature remains dead.