Umbral Possession

Umbral Possession (アンブラル形憑, Anburaru Tsuki) is a Caster Magic and a form of Seith Magic, which is used by Kagegisō.

Description
This magic allows the user to confine souls of various demons into shadows of inanimate objects or those, which are created using Shadow Magic or Shadow Dragon Slayer Magic. The user can also use their own shadow as a medium, however, this is considered dangerous and life-threatening, as not only the user cannot use any other advance-level magic during this process, but both physical and mental damage is also inflicted to the host. It is unknown if this magic can be used to inhabit the souls of demons in an opponent's shadow.

Trivia

 * The name of this magic comes from the word "umbra", which means "shadow" in Latin.