The Eye of Sheerian is an incredibly ancient jewel, named after the Tzeentchian Sorcerer who first discovered it, which dates back to the time of the Old Ones, before even Chaos walked the world. The jewel holds ultimate power over the flow of magic and it is said that whoever brings the Eye before the Gateway of the Old Ones will unleash the hordes of Daemons that are beyond it. Now that he has its proper setting, the Crown of Domination, Archaon can make full use of the Eye's prophetic powers. The visions granted by the Eye allow Archaon to predict the attacks of the enemy and counter or avoid them.