Deathcalibur

Deathcalibur is the polar opposite of Caliburn/Excalibur and the primary weapon of the Black Knight(a.k.a King Arthur). It has the ability to call forth knights from the underworld, shoot magical fire energy bolts, and transport its wielder. Deathcalibur came into fruition when King Arthur became enticed by the corrupted power of Scabbard of Excalibur; a scabbard able to grant immortality and great power at the cost of one's noble heart. After the noble king succumbed to the dark side, his sword Excalibur transformed into Deathcalibur.