The Four Horsemen of the Apocalypse lurk in the shadows before you. They are Death, Pestilence, Famine, and War. They are the root of all that is evil. They are the least of your worries. The last know Serpent Rider, Eidolon, lives. Thyrion is a world that was enslaved by the Serpent Riders. The two previous games in the series documented the liberation of two other worlds, along with the death of their Serpent Rider overlords. Now, the oldest and most powerful of the three Serpent Rider brothers, Eidolon, must be defeated to free Thyrion. Eidolon is supported by his four generals, themselves a reference to the Four Horsemen of the Apocalypse. To confront each general, the player has to travel to four different continents, each possessing a distinct theme. Then, finally, the player returns to Blackmarsh in order to confront Eidolon himself inside of his own dominion Cathedral.