Hidden deep in the forest is an enormous tower built within the trunk of a tree. Protected by hundreds of shields and charms crafted by top Alchemists, it can't be seen from airship even if you happened to fly right over it. This is the fabled Arch of Ages, a school and sanctuary for Alchemist. There are only two ways to find the Giant towering Tree: someone must lead you to it or you stumble upon it on foot.
