One day, not long after the formation of planet Alphemonak, a large asteroid with many miniscule life-forms crashed on the planet's surface, eventually causing a ring to go around the planet. One of the cells contained on that asteroid was the Zenothor cell, and the Zenothor species would go on to conquer all of Alphemonak and the Onotia system, and a thin path of systems leading to the Galactic Core.
When the asteroid crashed, it meant from an instant that life would explode, and live, and perish. But the Zenothor would end up standing on the ashes, the efforts, and the hardships of the other species. It was survival of the fittest, and the Zenothor were fit to dominate.