Darth Millennial was a three-eyed mutant Sith Lord and Shadow Hand, heir to the lineage of Darth Bane, who lived almost a thousand years before the Battle of Yavin. Apprenticed to Darth Cognus, Millennial was powerful in the Force and had the ability to see the future. However, he and his Master disagreed on many aspects about the Sith, and Millennial became disillusioned with the Rule of Two, which he felt was far too restrictive, and saw far more sense in Lord Kaan’s Rule by the Strong.
Eventually, he left his enraged Master and founded the Dark Force religion, which would later become the Prophets of the Dark Side on the planet Dromund Kaas. Proclaiming himself as a prophet chosen by the will of the Force, he attracted many Force-users from across the galaxy to his religion before passing away.