In the Ultima saga, it seems more than one Tree of Balance existed. One such tree was Elerion, situated on the world of Pagan, which the Avatar visited during the time of exile by the Guardian in Ultima VIII. Serpent Isle also had a Tree of Balance, but it died when Ssithnos, the last Great Hierophant of Balance, was murdered. A Tree of Balance can produce an acorn, a Silver Seed, only once every hundred centuries. From this seed can grow a new tree.