It's a fantasy role-playing game.

DM: You are Grog Strongjaw, a goliath barbarian . You are the member of the famous group of adventurers. Previously, The dragon hits them with a second breath shot after Delilah Disintegrates the wall they are hiding behind. Percy knocks her wand out of her hand and pushes her and Silas off the dragon, putting them in easy reach of the melee fighters.
DM: 23 points of damage? Are you rolling extra undead damage on this? On these attacks? Because she's not undead.
Player: Nope, nope. 23 plus-- I wasn't even adding-- I was so excited about the sword damage I was forgetting my rage damage.
DM: Right, but you rolled 3d10 there.
Player: I did, yeah. The d10 plus 2d10 slashing damage to undead right?
DM: She's not undead though.
Player: Oh, she's not?
DM: No.
Player: Oh shit.
DM: You've been adding that to all the attacks? Okay, noted. Roll--
Player: I figured she was dead, then not dead--
DM: Roll 4d10 for me right now. I'm going to retract that from the damage she's taken.
Player: 22.
DM: She's still wounded, but she's not hanging on by that thread. Okay, so the damage you rolled for that attack?
