The Great Weapon is the event that occurs in Battlefields of Eternity in Act V of Diablo III. In their wanders, the Nephalem may find a colossal round fissure amidst the Battlefields, with an opening to the south. Within that rift, one can see a gigantic angelic siege weapon (similar to those broken and scattered around). However, instead of the golden light, it has a dark red glowing at its core.