They were given powers by Talun, and so they were called wizards. Throughout Kemegere they built Towers which they lived in.
Most of the wizards were good, but one of them turned evil. He was corrupted and helped Milcoth and Morlred destroy Erdor.
Also several of the wizards did not care about the troubles of Erdor, and so they lived in secret, doing as they pleased. The wizards were often hated by the Sapientem, because they were considered an occult.