Epigoni

Epigoni (七門の粉砕者) is an artifact-class magic item which allows the user to open a locked door.

Description
Ainz Ooal Gown has one such magic item in his possession and used this magic item on the treasure vault door in Feo Berkana in order to gain access to the treasure stored within.

Appearance
It looks like a piece of hand-held board.

Abilities
Epigoni enables the user to open doors that would require the skills equivalent to a level 90 Rogue. While it possessed the lock-opening abilities of a level 90 Rogue, it was a magic item that could only be used seven times. Once the item is used the colour of a gem will be lost.

Trivia

 * The item is a reference to the Greek myth Seven Against Thebes, of how seven champions who were killed fighting against Thebes, after the fall of Oedipus, who shattered the Seven Gates of Thebes.