It's a fantasy role-playing game.

DM: You are Pike Trickfoot, a gnome cleric . You are the member of the famous group of adventurers. Previously, They are brought to meet Flamespeaker Cerkonos, the headmaster of the tribe. Cerkonos confirms that Keyleth's mother, Vilya, came through about ten years ago on her own aramente.
DM: All righty. Go ahead and roll your Guiding Bolt attack. Against which guy? These three here are visible.
Player: Okay. Let's do the guy right there. The big guy.
DM: Big guy right there? Okay. Go ahead and roll your attack. You add your spell attack modifier to it.
Player: That's only 15. 15?
DM: All right. 15 does hit, yes.
Player: Yay! Okay.
DM: That's 4d6 radiant damage, and the next attack against it has advantage.
