With peace in the land and no more villains to conquer, Arthur seeks to finally settle the score with Lancelot and Guinevere. After striking a devil’s deal with Merlin, Arthur gathers up his trusty knights and sets off for war against Lancelot. It’s brother versus brother and friend against friend, with Guinevere stuck in the middle, and everyone struggling to find the right course of action. But in Arthur’s absence, a new rival seizes control of Camelot and takes the throne, threatening that everything Arthur has dedicated his life may be lost.