This June, AEG will release the latest expansion to Nightfall:. This new set, Dark Rages, brings new monsters and new mechanics to the Nightfall universe. Following on the heals of Avatars for Thunderstone, it looks as if that mechanic will be added to Nightfall.
From AEG:
Dark Rages is a new expansion to the competitive deck building game Nightfall. Dark Rages brings you a complete all-new set of cards with special powers, and features new vampires, werewolves, hunters and ghouls. Dark Rages also introduces new Avatar cards that allow you to customize your decks’ themes like never before! Will you be a Vampire Overlord or a Werewolf Alpha, and which other groups will you ally with?