Whisper.

Casting this spell you whisper a single word. this word is heard by the envisioned target, this target makes a fortitude save, if they fail their soul is ripped from their body and delivered to you as wraith under your control, their body becomes an undead of the appropriate hit die. If they succeed they instedad take twice your level in necrotic dmg and are given disadvantage on their next save versus this spell for 24 hours.