Bronze Ioun Stone gives the wearer an extra lvl 7 spellslot. It can only be equipped by bards, mages and sorcerers. The stone weighs 2 lbs. The stone can also be used to upgrade the Circlet of Netheril.
This item appears in (ToB), it can be gained after laying the ghost to rest in the Saradush old prison.
|“||The powerful enchantments on this ioun stone make it a treasure eagerly sought after by wizards and mages.||”|