malygos strategy

Malygos, the Spell-Weaver, is the Aspect of the blue dragonflight. He's located within The Eye of Eternity in The Nexus, situated within Borean Tundra.
Guide
See this blog entry for an overview of the fight.
Loot
The actual boss loot can be found inside the Alexstrasza's Gift, which is spawned by Alexstraza after Malygos death.