Congenio Ioun

'Congenio Ioun was a great arcanist and inventor in Netheril. He is one of the few arcanists who was never know to create any spells. He did however create magical items known as Congenio's Pebbles, later to be called Ioun stones. Congenio is known to have created at lest thirty diffrent 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 397 NY