Apocryphal Notes

Apocryphal Notes (グレモリーの遺産,appakkurafaru nootsu; lt. "Gremory's heritage") is a Sacred Gear crafted after the death of king Solomon using one of the demons in the Ars Goetia to be sealed inside it.

It was created using the original Gremory as a base, but not sealing him inside of the Sacred Gear, but killing him in the process.

Summary
When king Solomon asked for wisdom to lead his kingdom, the god of the bible gave him vast knowledge to use at his pleasure. He gave the king knowledge about how to use demons at his favor, knowing that He would get rid of them, being princes and dukes of hell. However god did not expect the outcome that was produced.

When king Solomon inevitably died, the 72 demons that were held captive escaped from their containers and ran free in the world. The god of the bible then summoned his legion of angels to make them return to the depths of the underworld. This is the beggining of the Second Great War. However god took one in specific; the duke Gremory.

Gremory was a demon that knew everything, and his knowledge bothere God to no end. He in person went to where the demon was, carrying his legion of most trusted angels with him to hunt down Gremory, who was patiently waiting for him. Both of them already knew how things would unfold, being omniscient both of them Gremory gave up without fighting back and allowed himself to be turned into a Sacred Gear.

However Gremory acted like this as part of his plan. He knew that while god were in the earthly plane he would be affected by the Omnipotence paradox, thus making his own omniscience weaker than the demon's, ultimately making him fall for it, and allowing the others fighter to slay him while he was still on the Earth.

Appearance
Apocryphal Notes takes the form of a grimoire with light brown hardback which contains a symbol in both sides. Its pages seems antique and words are written in something similar to latin. While it seems like a book without many pages it has an unlimited amount of pages, something similar to what happens with a Death Note. A red tie stands out of the superior part of the book and serves as a bookmark.

Abilities
Gremory's Heritage is considered to be a support-type Sacred Gear. It unlocks the knowledge about magic spells and learns other's magic abilities to the user's purpose. It makes the user excel in the usage of magic and affects their knowledge.

The Sacred Gear was crafted using "Gremory's flesh as pages, his bones as hardbacks and his blood as ink", it allows the user to acces to their own mind, gaining complete control over themselves, meaning that feelings, memories, reflexes, etc. Can be manipulated freely, though doing the same to others is far harder.

Trivia

 * The image of the sacred gear was taken from Trinity Seven
 * The Omnipotence Paradox is an idea taken from To aru majutsu no index