The goal of Valeria: Card Kingdoms – Darksworn is to introduce co-operative play into the Valeria world through groups of related books called Sagas. These books will lead the players through a story that unfolds during the game and offers greater immersion into the Valeria setting. New rules and cards will be introduced in each book, some lasting only through the current book and some persisting through the unfolding Saga, somewhat like a "legacy game".