The Traitor Guard expansion brings a new playable hero and two alternative scenarios to Perdition?s Mouth. The scenarios can be played as one-offs or as part of the Abyssal Rift campaign. Perdition?s Mouth: Abyssal Rift is required to use the Traitor Guard expansion. The new Hero, Brother Orn, is a fallen guard who has been accused of being a traitor by his compatriots. Trustworthy? No way! But having a common enemy makes for a good motive for cooperation, especially if one is in dire trouble.