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Solomon's Gate is a Grimoire currently in the possession of Master Biblia.

It is only visible to mages possessing a certain amount of magic, however, it is stated that even the strongest mages lose their mind after staring at it for too long.

Lieselotte Sherlock, despite being a member of the Trinity Seven and a Magic King Candidate at the time, was visibly afraid of it.

The Grimoire appears as a large doorway at the Headmaster's back, with demonic-like creatures writhing on the doors' surface.

Solomon´s Gate (Manga)

Solomon's Gate (Anime)