Seilah is an Etherious Demon. She is a member of the Dark Guild, Tartaros, who's lead by the Guild Master, Lord Mard Geer. She's also the leader of the elite team of Tartaros, which goes by the name "the Nine Demon Gates", which consists of 8 other Demons: Kyôka, Jackal, Tempester, Franmalth, Torafuzar, Ezel, Keyes and Silver Fullbuster. She is also known as the Goddess of the Chill Moon. She's a human-like demon with dark purple hair and eyes, pale skin and two large gold-looking horns.