Cathan the Legacy Beast is a legendary creature of epic proportions. It has four arms, two legs, a tail, and may be the father of Reshiram, Zekrom and Kyurem. He had a leading part in a battle, long, long ago, when he was destroyed, scattering himself into ten parts: one for each planet in the Enere system, as well as his Heart, which went plummeting through space-time to Earth, creating the Energy Trio.
Thus, when all of thine immortale sectors be brought to rest upon the Great Altar, the beast of legends shall roam the stars once more.
Scripts of Time, on Cathan.