Janus Abigail

Key Magic: Janus Abigail (鍵魔法 『』) is a Key Magic spell.

Description
With an opened grimoire, the user opens up a magical space capable of storing objects and stolen magic from Janus Baptism within. The user can freely open the magical space through doors which have their own respective keys. The user can also freely use whatever stolen magic and spells are stored within the respective magical space.

The user can open multiple magical spaces, meaning that they can use a multitude of attacks and spells if needed, and can combine the attacks into various Compound Magic attacks if desired. After a key created from Janus Baptism is destroyed, the user loses the ability to continue using the magic sealed within the magical space, as the magic returns to its original owner.

Trivia

 * Janus is the Roman god of gateways and doors, among other things. He is also depicted as having two faces.