Along the way, Roy had been summarizing the rules of the time flux in his body. Although this time jump phenomenon came without warning, there were still traces to follow.
When Roy's time jump happened this time, it was at the point in history when the Battle of Nihilam occurred. Sargeras had destroyed the Pantheon of Order and killed his fellow titans with his own hands. However, Norgannon, the Keeper of Celestial Magics and Lore, saw that the situation wasn't good and made a last-ditch effort. He communicated with the two great cosmic energies of arcane and nature to protect the souls of every titan in an energy shield and temporarily send them into the Void World, thus allowing the souls of the gods of the Pantheon to be preserved in the tsunamis of the fel energy storm set off by Sargeras.
Sargeras didn't notice this. After destroying the bodies of the titans, he thought that he had won a great victory, so he also destroyed the negotiating venue, Nihilam.