Lagos was a powerful warrior demon, dangerous and feared enough that even Angel knew of him. In 1999, he made his way to Sunnydale in search of the Glove of Myhnegon, a gauntlet housing great mystical power. During his search through one of Sunnydale cemeteries, Lagos fought Faith Lehane and defeated her. The next night, Lagos ran into another Slayer, Buffy Summers, and fought her as well. However, this time Lagos was defeated and beheaded.