Possession Magic

Possession Magic is an unnamed, Caster-type Magic Spell involving the possession of the mind.

Description
The user creates a ghost-like apparition that approaches and then seemingly engulfs the victim, in reality entering and forcefully possessing the mind. The victim retains all memories and knowledge, and may benefit from even more knowledge, like how to use magic. However, their mind and personality becomes warped and corrupted, and can make a kind and strong-willed person into one of extraordinary evil.