He is a custom Star Wars Skin made by Spankymctanky.
He is higher than every other and is part of the old republic. He is the reason why the sith were created.
He lost everything at just when he was a Padiwan, causing him to go into deep madness and hatred for the Republic, so he created the sith.
Darth imperius would later become the ruler and founder of the Sith Empire .