The Demons of the Hall

You see a coalescing figure. It's one of those yellow demons that rises out of the mush and slides past you across the door. Can I cast knock on it? Isn't that like a spell that opens on the locked doors? Yeah, knock is a spell that'll unlock any locker, if it's non-magical. The door blasts open. This hall is empty. Save the human. At the sound of the knock spell, he takes notice of you. Striking the arm, holding the whip,. You're fla-uh, fuck. Your sword cuts into his arm wickedly. He responds by snapping his whip at you. Aaaah! You take 18