Eye of Balor

The Eye of Balor is one of six jewels that the Goa'uld once used as power sources. Though it was originally owned by the System Lord Balor, it was lost upon his death over the planet Magtireth. Anubis's agents were able to find the Eye, however, and stole it from Morrigan's planet. Anubis later used the Eye to power the superweapon aboard his mothership.