Keys Soul

"No matter the circumstance, I outnumber you, 72 to one! Metaphorically."

- Amorcaus proudly boasting about his magic Keys Soul (覇魔王の魂 (キー・ソウル), Key of Solomon lit. Soul of the Demon Overlord) is a Take Over-style and Caster Magic, compared to Satan Soul due to having a Take Over style that "takes over" demons and demonic entities. What differentiates between them, however, is that Keys Soul is a hereditary magic passed down through the Gorgon family, which houses 72 demonic souls, all which are accessible by the user. It's current user is Amorcaus Gorgon.

Trivia

 * Keys Soul references the Lesser Key of Solomon, the 72 demons of the Ars Goetia. All the spells are named after a demon's full name, title included.
 * Note; the author is not crazy enough to make 72 spells and demon forms.