Aeon of Strife

From The StarCraft 2 Wiki

The Aeon of Strife is a troubling part of Protoss history. Beginning when the Xel'Naga left Aiur, the Protoss tribes fought each other over the idea of the Xel'Naga; some wished to continue reverence of them, while other insisted all their relics should be destroyed. It was ended when Khas rediscovered the Khala.