This is just my theory: Imu was from the Kingdom, but was a misfit and outcast (Maybe a bastard child of the King?), and his hatred eventually worsened to the point where he'd rather trick the stupid humans below to destroy his own people and rule over them as the last of the "Gods".
He came to the Kings, told them lies and half-truths, stoking their own ambitions, and after they won, he was deified, and officially vanishes from history.....to rule from the shadows as King of the World. And became immortal, somehow.
He came to the Kings, told them lies and half-truths, stoking their own ambitions, and after they won, he was deified, and officially vanishes from history.....to rule from the shadows as King of the World. And became immortal, somehow.