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, Tiny you, thanks to a potion that does that. Scanlan managed to go ahead and put in an Immovable Rod within its stomach, which held it up for a moment, before it decided to truly gain the advantage it needed to escape the circumstance, allowed it to tear through its body, as well as an arrow that was shot by Vex, towards her brother, in the hopes of, I don't know, being a symbol of hope?
DM: 12 points of lightning damage. All right. The bolt of lightning bursts through the body. All righty. That comes to the top of the round. At the end of Scanlan's turn, it's going to use a legendary action to strike down, with the tail, onto Vax behind, as you are already in that vicinity.
Player: Dex save?
DM: No, this is instead going to be a 26 to hit.
Player: Yeah, that-- oh, displacer cloak. Did you do that at disadvantage?
DM: That is instead a 24 to hit.
Player: That does hit. I'll use Uncanny Dodge, though.
DM: All right. So what would be 18 damage, you take nine instead from the tail. Percy.
