Demonic Possession

Demonic Possession (鬼憑 Onitsuki) is a Caster-Type Lost Magic and one form of.

Description
A type of that allows the caster to seal wandering demonic souls inside objects and manipulate them as they wish such as weapons and armor; they can even be sealed in life-sized statues that can serve as the caster's personal army with a variety of purposes, such as offense, defense, and even transportation. Particularly skilled users of this magic can also confine the souls of demons into their body, or specific parts of their body, and then use them in battle. When the user summons the soul of a confined demons into themselves or one of their body parts, said demon's soul covers the body or the chosen body part in an aura.