Umbra's Voodoo Thrall

You craft a Tiny doll or puppet that resembles the target. The doll has an AC of 11, and 1 hit point. It is immune to all conditions as well as psychic damage, and is vulnerable to fire. A successful dispel magic used against the doll ends the spell. Otherwise, the spell's effect only ends if the target is the target of a remove curse or greater restoration spell, the doll is destroyed, or the target becomes incapacitated.

Immediately after you finish casting this spell, the target must succeed on a Charisma saving throw or take 4d12 necrotic damage that can't be reduced in any way. On a failure, the target's hit point maximum is reduced by an amount equal to the number rolled. On a success, the target takes half damage, and the doll is immediately consumed by flames and turned to ash as the spell ends.

In addition, by interacting with the doll, you can affect the target in a number of ways. You can manipulate the doll up to five times. Once you manipulate the doll for the fifth time, the doll is instantly consumed by fire and turned to ash, and the spell ends. 

Twisted Body. As an action, you twist and fold the limbs of the doll as the target's mimics the doll's form. The target takes 5d10 necrotic damage.

Leech Essence. As a bonus action, you pull a bit of the doll's stuffing out of its body. You regain 3d6 hit points.

Grasping Influence. As an action, you whisper in the doll's ear, issuing a command. The target must make a Wisdom saving throw as it hears your command whispered in it's ear. On a success, nothing happens. On a failure, the target is charmed by you for 1 minute, and follows simple commands from you. The charm ends if the target takes damage, or this spell ends.

Infernal Calling. As an action, you call the name of the target, summoning them to you. If the target is on another plane of existence, they must succeed on a Charisma saving throw or be instantly transported to the material plane in the last place they were. In addition, the target cannot use any portals, teleportation spells, or plane shifting spells for 24 hours, whether or not they succeed the saving throw.

Stolen Vision. As an action, you can see through the target's eyes as if they were your own, given that they or not on another plane than you are. While you perceive through the target, you are blinded and cannot take any action expect for to stop this effect.