The Void

The Void is the realm where the final battle of StarCraft II takes place, and it gives Legacy of the Void its title. After Artanis reclaims Aiur, Kerrigan sends a psionic call to Raynor and Artanis to help her kill Amon permanently in the Void. During the joint Terran Dominion, Zerg and Protoss assault there, Zeratul's prophecy becomes clear: only a fellow Xel'Naga can kill Amon, and only Kerrigan can ascend. She becomes a Xel'Naga and, with the rest of the armada, destroys Amon in the Void.