It's a fantasy role-playing game.

DM: You are Vex Vex'ahlia, a half-elf ranger . You are the member of the famous group of adventurers. Previously, you, Percy, and Keyleth go to the library to do research on the Nine Hells for their next mission. They find very little and move on to examining the papers they took from Raishan's lair, including the large book that Gilmore had cautioned them about.
DM: There is the one large dark leather tome that is still locked on the side, and that was what was on the--
Player: Right. That one feels, is like super scary-looking, though, right?
DM: Of all the books, it looks like probably the premium book of Opash's collection.
Player: Does it have writing on the cover?
DM: It has no writing on the cover. It is just a dark black, leather-bound tome roughly that big that looks like it's weathered, scratched in places. It has kind of like a deep, metallic cornered trimmed bits to it.
Player: But Gilmore looked at that. I had Gilmore look at it and he said it was scary.
DM: He said whoever decides to read it should be strong of will. That was his warning.
