ソウルエッジ
Four years later, Nightmare had begun on his Soul Edge ritual again in his old castle, wanting to resurrect Soul Edge, but his ritual was interrupted by an exiled French nobleman, Raphael Sorel. Although Raphael was utterly defeated, he was able to penetrate Soul Edge, which gave Siegfried and Soul Calibur the time to break free of its control fully. Soul Edge was then pierced by Siegfried using Soul Calibur, trapping them in the "Soul Embrace". While things seemed to go normal afterwards, Zasalamel had returned to try and free both swords, intending to use their power to break his cycle of reincarnation induced by Soul Calibur. He managed to do so, and Inferno took a physical form to become the "second Nightmare". Siegfried clashed with this new Nightmare, but was wounded in the process and had to be healed by Soul Calibur, tying him with it permanently, while Soul Edge was cast to the void to heal itself. The clash of Soul Edge and Soul Calibur had awakened Algol from his slumber, who rose the Tower of Remembrance to wait for warriors to challenge him. Meanwhile, Nightmare, with his servant Tira, wanting to gather the Soul Edge fragments to complete Soul Edge, forced several warriors, including Astaroth, Sophitia, and Voldo into servitude, while Siegfried, having recovered, set out to confront Nightmare. The two clashed for the second time in the Tower of Remembrance, where Siegfried managed to destroy both Nightmare and Soul Edge, seemingly once and for all.