One day, King Arthur became corrupt when an unknown evil came from his scabbard and tainted him, becoming the Black Knight. He has strong relations with the Knights of the Round Table, as they still serve him despite his change. His powers include using his blade, Deathcalibur, to summon Underworld minions to do his bidding and firing magical bolts on top of his impressive sword skills. His scabbard grants him immortality, making him impossible to defeat without obtain the three blades held by the Knights of the Round Table.