Nexus The Nexus is the name of a dungeon in " World of Warcraft " ( as well as the first instance of the same dungeon ) . It is an ancient ice fortress found in the center of Coldarra , an island in Borean Tundra . It is a " column of magical energy surrounded by levitating earth - covered rings " with ice caves underneath . Background . Originally the exclusive domain of Malygos , the Aspect of the blue dragonflight , the Nexus has expanded considerably as other blue dragons choose to live near their leader and partake of his wisdom . The Nexus is an extensive series of caves and tunnels that riddles Coldarra . Every space has been carved and smoothed so that it seems more like a castle buried in ice than a natural formation . The walls are ice and crystal , and cast rainbows of light from small glowing gems set in strategic locations ; most flat surfaces are carved to show dragon s in various activities . The floors are solid stone , polished glass - smooth and mirror - bright . No stairs exist — in many places an archway opens onto a vast open chamber and the dragons simply fly across to another portal placed somewhere on the other side . The outermost chambers are dotted with lifelike ice statues — the statues are the remains of uninvited guests , transformed by dragon magic and placed here as a warning . The caves themselves are fascinating , and many have unusual magical properties , some of the rooms may actually change . Wrath of the Lich King . The Nexus is a dungeon in Northrend contained in the " " expansion . At the Games Convention , Tigole confirmed that there will be two 5 - man dungeons and a raid where you encounter Malygos . To enter the instance before level 77 players must first do a quest line for a red dragon who then flies you to the entrance . There is composed of : From the official site . The Nexus War has begun . The blue Dragon Aspect , Malygos , was charged ages ago by the titans as the guardian of magic . More than ten millennia ago , he watched in horror as Deathwing all but wiped out the blue flight . Maddened by grief , Malygos withdrew to his lair and paid little heed to the rest of the world , emerging only when it finally seemed possible to avenge Deathwing ' s terrible crime . Only in recent times did Malygos fully return to his senses . Upon reviving , he quickly assessed the state of magical affairs in Azeroth and reached the grim conclusion that magic was running amok throughout the world . He blamed this dangerous development on the mortal races and their reckless pursuit of magical power . Determined to forestall a catastrophe , Malygos decreed that the world ' s unbridled magic must be reined in by any means necessary . And so the great Aspect turned to the Arcanomicon , a map of the world ' s ley line s . Gifted to Malygos ages ago by the titan Norgannon , the Arcanomicon has been continuously updated and revised by the blue dragons over the long years of Malygos ' s seclusion . Now Malygos uses the Arcanomicon to locate and tap into the ley lines , diverting the magical powers that course beneath the earth to his home base in Northrend , the Nexus . Once harnessed , the energies are focused through the Nexus ' ascending rings and blasted into the Twisting Nether . Malygos ' s redirection of the ley lines has carried disastrous consequences , however , splintering the world ' s crust and opening unstable rifts : tears in the very fabric of the magical dimension . Malygos ' siphoning of the world ' s magic has not gone unnoticed by the mortal races . The weakening members of the Kirin Tor , the elite magi of Dalaran , have sworn to fight Malygos to the bitter end . In fact , the magi have used their waning powers to transfer the entire city of Dalaran to float above Northrend . From this vantage point , the magi prepare for the next step in their battle against the Lich King , and for the inevitable confrontation with Malygos . However , not all of the Kirin Tor stand united . Several members have opted to side with the blue dragonflight in the hopes of retaining power . Transformed and bolstered by Malygos , these mage hunter s are tasked with rooting out and , if necessary , destroying magical artifacts ; killing or imprisoning individuals who practice magic without Malygos ' permission ; and aiding in the redirection of ley lines using massive constructs called surge needle s . The blue dragonflight ' s increasingly militaristic methods have been condemned by the red dragonflight . Charged with the preservation of life , the red dragonflight has vowed to neutralize Malygos at all costs . To this end , they have formed a council with the Kirin Tor , and the two groups have begun actively subverting Malygos ' s devastating campaign . The sides have been chosen ; the battle lines have been drawn . The only question that remains now is . . . Who will win ?