It's a fantasy role-playing game.

DM: You are Nott the Brave, a goblin rogue . You are the member of the famous group of adventurers. Previously, Caleb ignored her and continued to examine the area around where Fjord vanished. While there are no buttons or hidden doors, there is a large red leather-bound book with sapphires embedded in the cover conspicuously placed in the center of a bookshelf.
DM: You look it. You're like, "This is not moving." You're not sure if it's trapped, necessarily. But glancing at it, you're like, "This is locked," and it's locked in a way where you're not entirely certain. You could try, but it's going to be a very hard lock.
Player: I'll try.
DM: Go for it.
Player: Natural ten.
DM: Total of?
Player: 20.
DM: 20? It's not budging.
