Cathedral of Eternal Night: Altar of the Aegis

Champion, we are ready to assault the Tomb of Sargeras. I studied the writings of Aegwynn, the Guardian who defeated the Dark Titan's avatar. She said that if her wards were compromised, a failsafe could be triggered by placing the Aegis of Aggramar upon an altar in the Cathedral of Eternal Night. You are the hero who acquired the Pillars of Creation, ‹name›. Gather your allies and enter the Cathedral. Be warned: Mephistroth will use all his power to stop you from placing the Aegis. You must prevail!