Eye of Tiamat

The Eye of Tiamat is a jewel that the Goa'uld Marduk possessed. The eye was supposed to grant Marduk "magical powers". It was locked with him in his sarcophagus when his priests rebelled against him. Colonel Zukhov located the eye, but it was buried with him when he tossed a grenade at Marduk. The Eye was later recovered by Anubis, who used it to power the superweapon aboard his mothership