Congenio Ioun

Congenio Ioun was a great arcanist and inventor in Netheril. He was one of the few arcanists who was never known to create any spells, but he did however create magical items known as Congenio's Pebbles, later to be called ioun stones. Congenio is known to have created at least thirty different types of Ioun stones. Congenio was known to have several ioun stones circling his head at all times.

He created his first ioun stone in -3462 DR. He is considered the first great arcanist of Netheril.