The tree of being is the tree that can create portals into different worlds. It will appear on anywhere in Avantia , dig into the ground and appear somewhere else . Sanpao has ripped off all the branches of the tree making it sick and weak. In that condition it cannot create portals; only when it is healthy again can Tom create a portal to Freya and Silver in Tavania to rescue them, which he will in book 48 - Bloodboar the Buried Doom. The tree first appeared at the Western Ocean and then reappeared at the Grassy Plains then the Vanished Woodland then The Northern Mountains then The Icy Plains and lastly in Tom's final stage of this quest, the palace of King Hugo.