Nexus War The Nexus War was a conflict between the blue dragonflight and the alliance of the Wyrmrest Accord - a coalition of the four remaining dragonflights - and the Kirin Tor of Dalaran . The war was instigated by Malygos the Spellweaver , the Aspect of the blue dragonflight and Lord of Magic . The term " Nexus War " first appeared on the official website for " " . Prelude to the Nexus War . Malygos fled to his lair in Northrend after the near - total destruction of his dragonflight at the hands of the Black Aspect Deathwing . The grief of losing his children to the treachery of one who was a friend drove him to madness , and he remained hidden away for ten thousand years , paying little heed to the rest of the world . He left that seclusion only once , shortly after the Second War , when the Aspects united briefly to battle Deathwing and end the corruptive influence of the Demon Soul . Malygos ' madness and seclusion ended when Tyrygosa returned from Outland with the nether drakes she had liberated in Netherstorm . Their nether - warped physiology helped Malygos recover some of his lost sanity . As he recovered , the Spell - weaver saw that magic had run amok throughout the world of Azeroth , and he blamed this on the reckless use of magic by the mortal races that had arisen in his ten millennia of isolation . Seeking a solution , Malygos turned to the Arcanomicon , the map of all of Azeroth ' s ley line s granted to him by the Titan Norgannon . Using the map to locate all of the world ' s ley lines , Malygos began to divert their energies into his domain , the Nexus , on the island of Coldarra in Northrend ' s Borean Tundra . They were then channeled through the floating rings of the Nexus and blasted into the Twisting Nether . The Battle Lines Are Drawn . Malygos ' actions led to rifts opening in the fabric of magic itself . This siphoning of the world ' s magic also did not escape the notice of the mortal races - particularly the remnants of the Kirin Tor , the elite magi of Dalaran . Realizing that Malygos had become a very real threat , the Kirin Tor used what remaining powers they had to magically transfer the rebuilt city of Dalaran to the skies of Northrend , right on the front lines of both the war with the Lich King and the coming battle with Malygos . However , there are some members of the Kirin Tor who believed that allying themselves with Malygos would be far more beneficial . Betraying their own brethren to preserve their own power , these mages have been transformed and bolstered by Malygos to become the dreaded mage hunter s . Their duties included killing or capturing those who wield magic without Malygos ' consent , destroying magic artifacts and aiding in the redirection of the ley lines using surge needle s . Malygos ' genocidal campaign has also incurred the ire of the red dragonflight , charged by the Titans to preserve life . The Dragonqueen Alexstrasza , Aspect of the red dragonflight , has allied her dragonflight with the Kirin Tor in their efforts against Malygos . With their focus shifting from the conflicts in Outland to the continuing battle against the Scourge , the adventurers and champions of both the Alliance and the Horde will also have a part to play in the war against Malygos . . . End of the Nexus War . The final blow against Malygos was struck thanks to the efforts of mortal heroes fresh from their victory over Sapphiron , the frost wyrm guardian of Kel ' Thuzad , in the heart of Naxxramas . As a member of the blue dragonflight in life , Sapphiron still carried on his person a key to the focusing iris at the center of the Eye of Eternity , Malygos ' inner sanctum . The heroes delivered the key to Alexstrasza , who enchanted it with her power . The key could then be used to open the focusing iris and lure Malygos into battle . With the key prepared , Korialstrasz made the fateful request : Malygos must be slain , and the Heart of Magic , his most prized possession , taken from him as proof of the deed . With their orders in hand , the heroes entered the Eye of Eternity and confronted Malygos in the final battle , where they were joined by drakes of the red dragonflight . With the combined strength of the heroes and the drakes , Malygos was defeated . After Malygos ' death , Alexstrasza herself arrives to speak to the heroes : Aftermath of the Nexus War . In the wake of Malygos ' death in the Eye of Eternity , the future of both the blue dragonflight and of the world itself is uncertain . After the Heart of Magic is taken from the slain Lord of Magic ( / ) , Krasus remarks that " magic is now without its guardian " and that " a storm is still brewing on the horizon and now we are without one of our most powerful defenders " . Since the release of patch 3 . 3 . 0 , Kalecgos has been stationed at Wyrmrest Temple as the ambassador of the Blue Dragonflight . This may mean that the Blue Dragonflight has been readmitted into the Wyrmrest Alliance , however the leadership of the Blue dragonflight is unclear at this time . After the Cataclysm , Kalecgos has been named the new Aspect of the Blue Dragonflight , though even this did not proceed as planned : Arygos grew jealous of Kalecgos and defected to the Twilight ' s Hammer out of spite , desecrating the Chamber of the Aspects and causing the death of Korialstrasz in the process .