It's a fantasy role-playing game.

DM: You are Tiberius Stormwind, a dragonborn sorcerer . You are the member of the famous group of adventurers. Previously, The party, after essentially forcing this individual to reveal themself, the rakshasa fled through a tunnel underneath its room into a long subterranean tunnel fraught with traps that were set to protect it. The party managed to avoid these rather deftly until the steady decline of the hallway, combined with the increasing moisture and scent of refuse, caused a slick surface and our fantastic cleric, Brother Kash, Kashaw, slipped and fell down.
DM: 16. You can feel the diseased liquid that fills the inside of the otyugh's mouth begin to pulse into your arm for a second. You tense, and eventually the pain and numbness tends to fade within a few seconds. However, as you take that moment to yourself, as it's still grabbing you with the one tentacle, it's going to reach and attack twice towards Tiberius. That is going to be a 16?
Player: Nope.
DM: Okay. That'll be a 19.
Player: Yes.
DM: So the second one hits you. That is eight points of bludgeoning damage and five points, so 13. Half that because of Stoneskin. That puts you at seven points of damage. And you are once again grappled and wrapped up by it.
Player: I think he likes me!
DM: I think you pissed it off when you set it on fire multiple times in a row.
