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, Grog and Arkhan together smash the wall to pieces, dislodging the crystal and opening up one-sixth of the barrier dome above them.
DM: He runs up the side. (impacts) He glances down, looking towards where you are. All right, that's going to bring us to Vax's turn.
Player: Yeah, okay, so if I get to the very edge there, am I in range of Delilah on the ground with Sharpshooter? Cover doesn't do much, except full cover.
DM: Yeah, she would have cover in this circumstance, but you avoid it with Sharpshooter, so you can.
Player: And am I within 60 feet over there, about?
DM: Yes.
Player: Okay, I'm going to throw Whisper at her, and she's down, so I have advantage. That is a 27 to hit.
DM: 27 to hit hits.
Player: And I'm going to bamf there.
DM: She's prone, so yeah. You have disadvantage on the attack against her.
Player: What, because she's prone?
DM: It's a ranged attack. You don't have advantage against her because there's nothing giving you advantage.
Player: Her being prone doesn't give me advantage?
DM: No, her being prone, against ranged attacks, it's with disadvantage. Roll a second time.
