The Return of Lord Xiao

Xiao was a well known dark realm master who can never be defeated he takes no disciples except for one exemption. He trusted this one disciple of his and taught every single thing he once learned when he was young, but a war suddenly emerged! and all the the Seven Rulers wielded a sword to take the head of Xiao. The reason for it was because Xiao holds a piece of artifact that can turn a human being into an immortal god. Due to the Seven Lords greed they planned to joint effort and kill Xiao. Xiao fought them with all his might and defeated them all, as he was resting his disciple pierced a dagger in his heart. Xiao was stunned as he witness his one and only disciple killing him with cold blooded eyes...As he fall down the ground he asked his disciple 'Why?' His disciple replied 'You are the master i have indeed serve but you are just a tool for me.' Hearing those words Xiao felt pain and slowly losses consciousness. When he woked up he became that of another man?