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, Grog almost succumbs, but the vampire's powers cannot penetrate the heightened rage that already fills his mind. Meanwhile, you also observes Lord Briarwood's withdrawal and charges him, divine energy radiating off of her blazing form.
DM: Yep, when any creature within 30 feet makes an attack roll you can use your reaction to grant that creature-- usually it's against other creatures. Okay. War God's Blessing you can only use on other creatures, but you do have Channel Divinity: Guided Strike, which you can use on yourself. It's essentially the same thing. You give yourself plus ten bonus to the roll.
Player: Okay.
DM: So you use your Channel Divinity Guided Strike instead?
Player: Got it.
DM: Okay. So that would bring you to 26? That would hit.
Player: Okay.
DM: Okay. All right, so you slam down onto Sylas with your Mace of Disruption. Go ahead and roll damage on that. He is considered an undead.
