Ebynogoi (エビノゴイ) is an artifact class magic item which allows the user to open a locked door.
It looks like a piece of hand-held board.
Ebynogoi enables the user to open doors that would require the skills equivalent to a level 90 thief. While it possessed the lock-opening abilities of a level 90 thief, it was a magic item which could only be used seven times.
- Despite its pronunciation, it's actually written as 七門の粉砕者, meaning the destroyer of seven doors which explains that it can only be used seven times.