Who is Master Patterner from The Other Wind and what is their importance?

The Master Patterner (Azver), once a Kargish warrior, gave up his homeland to seek the centre of the world; the Immanent Grove, where he learned about the deep mysteries of the Earth, and the equilibrium at the heart of all things. Master Patterner sets the story on its way to a resolution, as he asks Alder to seek the advice of Ged the Archmage, and then finally accepts all of the characters back to the Grove to seek a way of restoring the balance.