The Grimoire

The Grimoire, or Demonic Grimoire, is an item that appeared on Season 4.

Description
A Grimoire is a manuscript a person or mage uses to write his spells, how to create charms; talismans or amulets, or summon paranormal beings.

Episode 4
First, the devil summoner Raidou Kuzunoha drew the book from under the ring to attack Kazuma Kiryu, probably accidentally invoking it due to his connection to demons.

Later, Mr. Bones instructed his Servant, La Parka, to use it to steal Doomguy's soul and make it his minion.

The full extents of the power of the Grimoire are unknown, but it is probably a very powerful artifact, maybe even coming from Mexico.