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: 19 on him? Okay. So it's still alive, just looking really, really rough. The brain's just now pierced with a bunch of arrows, some of it, it's barely holding itself on top of its feet. And the troll also takes the damage as well, just seems to shrug it off, just seems to angrily-- roars up from the bottom of the temple at you, now seemingly helpless in the current circumstance.
Player: So then I want to attack the Elder Brain again.
DM: All right. So you release it down.
Player: 20.
DM: Very nice, that hits, go ahead and roll damage.
Player: All right. 11.
DM: 11 points of damage, all right.
Player: Oh, wait, wait! No, lies! 13.
DM: 13, okay, there we go.
