A Symphony of Frost and Flame A Symphony of Frost and Flame was the final battle between the Lich King ' s Scourge led by King Arthas , and Kil ' jaeden ' s agents led by Illidan Stormrage . Introduction . " Moments later , at the Scourge stronghold , King Arthas and Anub ' arak make their final plans to defend the Lich King ' s Throne Chamber . " King Arthas : Time ' s running out , Anub ' arak . We ' ve got to get inside the Throne Chamber before Illidan does . Anub ' arak : The Throne Chamber lies within the frozen peak at the center of the valley . It can only be opened by activating the four enchanted obelisks that surround it . Illidan ' s forces have already entrenched themselves near two of them . We ' ll need to drive them back and reactivate the obelisks ourselves . " Meanwhile , Lady Vashj and Prince Kael approach Illidan . " Lady Vashj : We ' re sorry to interrupt your meditation , Master , but all our forces are in place . Prince Kael : Once the chamber is open , we will destroy the Frozen Throne as promised . Illidan Stormrage : Then the hour has come at last . After today , the Scourge will meet its end ! Can you hear me out there , Arthas ? Its end ! " Arthas and Anub ' arak are watching the situation from above . " King Arthas : Illidan has mocked the Scourge long enough . It ' s time we put the fear of death back in him . Prelude . After forcing their way past the horrors of the dark catacombs of Azjol - Nerub , Arthas and Anub ' arak rendezvoused with their army at the peak of Icecrown Glacier , with the intention of claiming the Frozen Throne in the name of Ner ' zhul . They were dismayed to find that Illidan ' s forces had already arrived , were well entrenched around the pinnacle of ice which contained the Lich King , and were poised to claim the four Icecrown Obelisk s which when activated would open the prison . Final defeat for Arthas and Ner ' zhul seemed all but assured . Strategy . You will start off with a considerably sized force ; however , it will not be enough to win immediately . Send your forces to a nearby Naga outpost and destroy it ; it is poorly guarded , with a few naga sirens and tidal guardians for defense . During this time , Illidan will most likely capture the northern obelisk . The northern obelisk will be heavily guarded , however , any other obelisk he captures will be lightly guarded . Because this obelisk is the most heavily guarded , Illidan will take some time to build its considerable defenses . Start building up a base and expand quickly , since Illidan will be getting the other obelisks fairly quickly . You need a good attack force by the time Illidan captures the third obelisk , as if he captures the fourth , you will lose . Have a defending force at your base when you have no obelisks captured , as Kael and Vashj will continually attack you . As soon as you capture an obelisk , they will focus onto your obelisk instead , although they will occasionally send an attack force at your base . To aid in base construction , there will be two sacrificial skulls to aid in base production . Use the blight created from one to create a graveyard to generate corpses for Anub ' arak to create Carrion Beetles to boost your forces and the other to create ziggurats . Ziggurats are made fairly quickly and will generate new blight as well as food to create new buildings and units . If you harvested all the gold from the previous three chapters , you will have a considerable amount of gold to aid in creating a base . Just north of the outpost , there is a goldmine . Haunt that goldmine as well to double gold generation . In addition , upgrade to a Black Citadel as soon as possible to enable purchase of the Orb of Corruption as well as generate useful abilities for units . A desirable attack force is one composed of meat wagons , with the exhumed corpse ability , necromancers to take advantage of the corpses within the meat wagons , and frost wyrms , enhanced with unholy frenzy . As a result , you can generate a massive army of skeletons to take out the enemy forces while the meat wagons attack the buildings . If you are playing on hard , attacking buildings will trigger enemy units to attack the meat wagons , but the massive skeletal army will almost completely block the enemy units . This will keep them from doing much harm to your army while your army takes out the enemy units . Quickly construct a defense near your captured obelisk , using Sacrificial skulls from the Tomb of Relics to build Ziggurats immediately , since building a Haunted Gold Mine or Necropolis will take too long . Continue defending and expanding and start to recapture the other obelisks , which Illidan will have built his defenses for . You can opt to take out Kael and Vashj ; this will only leave you with Illidan to deal with . Destroying their respective altars will yield very powerful items that will prove useful against Illidan . Illidan ' s base is secluded in the northeastern corner , with a deep water blocking the way . The only way to attack his base is with possessed naga units , gargoyles and frost wyrms . Once you capture all four obelisks , victory is yours . Possessing the Mur ' gul Slave s or Workers will be pointless as they cannot build anything . The battle . Arthas and his army quickly wiped out a small naga outpost to the south west of the Frozen Throne and used the resources gathered from the ruins of Azjol - Nerub to establish their own base . From there Arthas and Anub ' arak launched their attack against Illidan , Prince Kael and Lady Vashj . During this time , Illidan began capturing the obelisks , defeating their defenders ( a small group of frost and ice revenants ) . Illidan began capturing more of the obelisks , while the Undead were at a disadvantage as they had to build up a base to send forces of their own to counter their enemy , and were hounded by Kael ' s blood elves and Vashj ' s naga . Eventually , the Undead managed to rout the blood elves and Vashj ' s naga , leaving them with only Illidan ' s naga . After a hard fought battle , Arthas managed to claim all four obelisks and entered the Frozen Throne . Aftermath . Arthas destroyed the Frozen Throne , and merged with Ner ' zhul to become the new Lich King . From his Icecrown fortress , the Lich King made plans to rebuild his forces and conquer the rest of the world . Illidan was apparently driven mad by the encounter ; he crawled back to Vashj and Kael , who retreated with their remaining forces back to Outland . He brooded in his Black Temple until a brave band of adventurers , assisted by Maiev Shadowsong and Akama , finally killed him , ending his reign over Outland . Later , in Icecrown Citadel , the Lich King was finally slain by another band of adventurers assisted by Tirion Fordring and King Terenas Menethil , ending Arthas ' s reign and the Scourge once and for all . Bolvar Fordragon eventually became the new Lich King and now commands the " new Scourge " from the Frozen Throne .