Premonitions

With the Belsavis Uprising repelled and the age of his original timeline looming, Orono delved into the future to see what lay ahead. He saw that he would be able to perpetually resist the will of the Force if he would do three things: feed information to the Sith in order to destroy stagnant teachings, strip any members of the Skywalker line of their power, and destroy an artifact known as the "Vein of Evil". This was  known as the Unholy Ritual. With such power he would last until the stars blew out like candles in the wind and planets would come and go like drops of rain, effectively until the end of time...