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, Percival shoots Clarota in the head, releasing Scanlan, who had been grappled by the turncoat. As the remaining illithids take heavy damage, the two of them Plane Shift out of the room in self-preservation.
DM: Very, very expensive potion used. All right, so. Vex? You're on Trinket still, do you want to hold your action and wait for the rest of the carpet, do you want to attack anyone, what do you want to do?
Player: I want to attack the Elder Brain.
DM: Okay. Go for it.
Player: I'm going to-- I think all I can do is a Conjure Barrage.
DM: Okay.
Player: So it's the cone of attack.
DM: Yeah.
Player: So that will get hopefully all the things, because I'm shooting down, right?
DM: Well, how big is the cone?
Player: It's 60 feet.
DM: 60-foot cone from your angle here, if you're going for the brain it'll catch this guy, maybe, as a cone that goes down this way.
Player: Okay.
DM: Unless you want to go this way and hit these guys, or this guy.
