Malygos, the Blue Dragon King, had already lost his mind ten thousand years ago during the War of the Ancients, when Deathwing used the power of the Dragon Soul to slaughter the Blue Dragonflight. No one knew why he had suddenly regained his sanity, but it was clear that his memories remained fixed ten thousand years in the past, before the War of the Ancients. So when Malygos returned to Wyrmrest Temple and learned that his beloved Sindragosa—and all the other blue dragons—were dead, the Blue Dragon King was struck another terrible blow. This time, however, he did not descend into madness again. His mind had grown more resilient after the first ordeal.
Though Malygos did not go mad again, the crushing blow changed the once-gentle, kindly dragon. Reality turned the benevolent Blue Dragon King into an extremist. He believed that magic, the power of the Dragon Aspects, could no longer be left in the hands of mortals. Anyone but him who wielded magic was a threat to Azeroth, a danger to world peace.
The five Dragon Aspects were evenly matched, each with their own strengths. None was physically stronger than Neltharion, the former Black Dragon King. The Red Dragon Queen, Alexstrasza, held the secrets of life, while the Green Dragon Queen, Ysera, possessed immense mental power and could easily pull enemies into an illusion. And Nozdormu, the Bronze Dragon Aspect, went without saying—he could journey through time and see both past and future.
But when it came to destructive power, none could rival Malygos, the Blue Dragon King, master of magic. His draconic body gave him seemingly bottomless reserves of magic, and his immense mental strength let him effortlessly cast forbidden spells that took humans and even High Elves ages of preparation. It was no exaggeration to say he