According to the Pantheon's records, Sargeras had fallen because he had encountered too many dark beings over millions of years of war. That darkness had accumulated within him, until it was finally triggered by a race of demons called the Nathrezim, who specialized in Mind Plague.
But Dick and Elune knew that was not true!
With Sargeras's power allowing him to rampage across the universe, the Nathrezim, who were at most demigods, could not shake his resolve, let alone penetrate the deepest reaches of the Bronze Titan's mind. The Nathrezim had taken the blame, a burden they could never have borne in the first place.
The true reason for Sargeras's fall was that tiny cracks had already appeared in his steadfast mind during his battles on the front lines against chaos. The other Titans had experienced the same thing, but they had enough time to purge that corruption. Sargeras did not. As the Pantheon's defender, the Bronze Titan was fighting almost every moment.
The Nathrezim's mistake had been using Mind Plague on Sargeras at the wrong time, triggering the chaos within the Bronze Titan. Caught off guard, his final mental defense had fallen.
But in truth, even to this day, Sargeras had never truly fallen. Even as the Burning Crusade continued, the Dark Titan was still fighting chaos. He was the first being Dick had ever seen who continued to resist chaos after his own body had been corrupted. That alone was enough to show how powerful Sargeras's mental defenses were.
His condition was very similar to that of the Black Dragon Neltharion, but he was far stronger than Deathwing. However, this corruption could spread. After his soul fell into darkness, Sargeras had used the same method to corrupt Aggramar, his former deputy, a powerful Titan who had become his