It's a fantasy role-playing game.

DM: You are Vax Vax'ildan, a half-elf rogue . You are the member of the famous group of adventurers. Previously, At the Platinum Sanctuary, the twins are greeted by Highbearer Vord. He offers to seal Opash's book in a vault beneath the city, but you, who doesn't entirely trust him, tells him they didn't actually bring it with them.
DM: It's how nimble your fingers are. It's a dexterity bonus plus the proficiency modifier for a disguise kit. If you are proficient with this kit, with the disguise kit?
Player: Oh, my gods.
DM: What are your proficiencies?
Player: I don't think so. I mean, I don't know, so I'm just going to say no.
DM: Then it's just dexterity.
Player: Dexterity.
DM: Just roll a d20, add your dex bonus.
Player: Okay. All right, I'm going to go for like, a General Krieg-type look to the face? I'm going to do my best--
DM: Okay.
