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, Judging by the weather, they have arrived somewhere in Exandria. As Vox Machina comes within range of the base of the tower, they are addressed by an omnipresent, directionless voice.
DM: 18. Just ricochets off the armor. There's one here that's going to go toward Pike. And you're not held, right? You resisted it. So it's going to go ahead and make a strike on you; that's another 15. Just hits your armor and scrapes off, no effect. This one's going to rush forward, two against Vax on the ground. It has advantage. That's a 19.
Player: To do what?
DM: To attack you.
Player: All right, so I'm at disadvantage, but I have advantage, so it would be one straight roll?
DM: No, it has advantage against you because you're paralyzed, so yeah, it would be one straight roll. The first roll was 19.
Player: Oh, so no.
DM: No. Your armor class is 21 naturally?
Player: It is 21 when the daggers are out, and my daggers are in my hands. I mean, I don't know, this is kinda loosey-goosey. All right, then I'm at 20.
DM: Yeah, so it still misses you. The other one, no, misses. Both of them just miss you. The effect of the 9th-level spell is just enough of a vibration that the attacks are being-- You're moving just, (grunts) ever so faintly out of the way.
Player: Familiar.
DM: One attacking Keyleth. That is a 24.
