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, As they catch up with the titan, Grog's Titanstone Knuckles begin to vibrate in resonance. Still about 200 miles away from Vasselheim, Scanlan and J'mon render the group invisible for the approach to the titan.
DM: As it attempts to dive past you, you duck out of the way, still nocking a secondary arrow. Its claws hits the back of the dragon scales. You hear the scrape of it going across the back, but having no effect on the hard, armored brass dragon's back. The gloomstalker then shrieks once more and takes back up into the clouds and vanishes.
Player: Did I get an attack of opportunity on it with daggers?
DM: You can definitely attack it with daggers, if you'd like.
Player: Yeah, that hits. 29.
DM: That hits.
Player: If my friend the dragon is against it, do I get sneak attack?
DM: No. Sorry.
Player: All right. That is 12 for that.
DM: 12 damage. How much damage did you do?
