The Landpoison of Yamato was a disease which had slowly ravaged Yamato through the Cursed Earth in the Third Age. It had originated from the corruption of Yggdrasil, the first World Tree, on the Isle of Yggdrasil in the First Age. Leon Alcibiates led Geraud Aurelac and the Silver Branch to the Isle of Yggdrasil during the Great War and found the withering World Tree. In order to heal the Tree before it would die, Geraud sacrificed himself by fusing with the Silver Branch and Yggdrasil's remaining energy to become the second World Tree, the Silverbranch Tree.