Talk:Nightmare VS Guts/@comment-25182985-20150321005907/@comment-5035900-20150321203723

Well Night Terror was made with specific conditions (being powered by both Soul Edge and Soul Calibur), and officially never appeared in the story, as Siegfried and Nightmare battled with their respected swords in the cathedral, which then was destroyed while they were nearly killed, so that has Night Terror being nearly non-canon officially.

As for destroying Soul Edge for good (which I don't think is required for Guts to win against Nightmare), it was by destroying both swords with each other as shown by the end of Soul Calibur V... unless a sixth game takes place afterward and goes "Nah, they came right back afterward."