Just as Boss Hu was wildly flirting with girls and the various Northern Expedition forces marched upward at speed to join the Alliance and Horde armies locked in fierce battle in the fortress's central region, a massive battle was also breaking out higher up in the fortress, near the Frozen Throne.
The overwhelming Blue Dragonflight suddenly launched an aerial assault on Icecrown Citadel. They had only one target: the Frost Dragons' nest, and Sindragosa.
The Dragon Aspects' large-scale assault on the Spider Kingdom had successfully served as an excellent—and genuine—cover, causing the Lich King to temporarily overlook the Blue Dragonflight's highly unusual and suspicious behavior.
Of course, the Blue Dragonflight had not forgotten their hatred. So now, they had come.
The Blue Dragon King Malygos's enormous body, large enough to blot out the sky, flew at the forefront with a howl. His huge eyes brimmed with killing intent and hatred.
"Kill every one of these defiled brethren! Bring back their remains and prove our strength! The Father God's radiance will return them to eternal rest! And Sindragosa... my love, she will return to my side as well!"
On the open-air platform high atop the fortress, dozens of Frost Dragons also let out piercing roars before spreading their wings and taking to the sky to meet these uninvited guests—their former living kin.
"Malygos! You dare come here! Northrend's icy winds will sweep away your souls!"
A mature female voice rang across the sky. Then the Blue Dragonflight saw an exceptionally enormous Frost Dragon fly out from the depths of the platform.
"Sindragosa... my love... look what the Lich King has turned you into."
Dark purple Arcane energy flowed across Malygos's foreclaws as he effortlessly snapped a Frost Dragon's neck, severing its head from its skeletal body.
"I... hate the Burning Legion!