The medieval King Arthur and the Knights of the Round Table are usually depicted as heroes, fighting off the Anglo-Saxons as they try to take over Britain. In Sworn, a new co-op roguelite that takes inspirations from Diablo and Hades, Arthur is corrupted, and you must fight through a fallen Camelot to slay him and save the realm.
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New King Arthur roguelike is basically a co-op Hades set in Camelot