From publisher blurb: Holy Diver is a story roleplaying game homage to Ronnie James Dio. With characters and events drawn directly from the lyrics of Ronnie James Dio songs (from Rainbow, Black Sabbath, and his self-titled work), the game is a strange trip through the golden lyrics of the metal god himself. Specifically, the game is about fantasy adventurers on a quest to the Silver Mountain, to see ‘the Witch’. The adventurers may never come home. Each game in the Protocol series is zero-prep for 3 or more players. The game length is exponentially long, so games with more players take more time to complete. The Protocol Series requires a deck of poker cards as well as tokens to track drama points.