Nightmare (ナイトメア, Naitomea) is the main antagonist of the Soul series. He made his first appearance in Soul Edge, with his proper debut being in Soulcalibur. He is the host, wielder and living incarnation of the cursed sword, Soul Edge, the objective of most other characters in the story.
Nightmare has been portrayed in the games as a violent and ruthless creature, constantly in search of souls to restore Soul Edge. He looks down on humans, considering them “pathetic” and “foolish”, having no mercy for others, even to those who fail to serve him, as shown to the members of his Schwarzstrom team who he treated as pawns. The only one who he treats with some respect is Tira for being just as violent as him, however he has still thought about taking her soul on occasion. His incarnation in V wants to take over the world rather than destroy it.
Description by soulcalibur.fandom