Icecrown Citadel is the greatest fortress of the Scourge and the last bastion of the dread Lich King. Located in the frozen wastes of Icecrown on the continent of Northrend, the Citadel is built around the Frozen Throne that once held the spirit of Ner'zhul until he joined with Arthas Menethil to become the new Lich King. Constructed from saronite, the Citadel is inhabited by some of the strongest and vilest of the Lich King's minions - a great army of the living dead standing between their dark master and those who seek to destroy him.
The name of Icecrown became infamous when Kil'jaeden hurled the Lich King back into the mortal world. Ner'zhul's prison slammed into the glacier. Here the Lich King remained until Arthas Menethil freed him and the two merged in Arthas' body. The merging created such a large explosion that a large portion of the glacier was blown away. It left a gigantic spire of ice: the Frozen Throne, upon which sits the Lich King, ruler of the Scourge.
Wrath of the Lich King
Icecrown Citadel dominates Northrend - visible from farther away than nearly any other structure and home to the greatest army of undead in the known world. Inside dwells the Lich King - a tyrant with nearly godlike power over his tireless, seemingly infinite subjects - and the will to bring Azeroth to its knees.
An assault on the mighty citadel is among the most dangerous undertakings in the history of Azeroth - and the most pivotal. The legendary heroes Highlord Tirion Fordring of the Argent Crusade and Highlord Darion Mograine have joined forces to lead the charge through Icecrown's fortified gates, and both the Horde and Alliance have sacrificed lives - indeed, whole battalions - to get this far. They dare not fail. The Lich King's reign must end.
Icecrown Citadel is a massive structure located on the Dragonblight-Icecrown border. Its southern entrance, Angrathar, the Wrathgate, is surrounded by the Court of Skulls, and flanked by Fordragon Hold and the Kor'kron Vanguard. The fortified northern entrance to Icecrown Citadel, surrounded by the Court of Bones, is found in the mountains of southern Icecrown. It is surrounded by gigantic ramparts and massive, blade-like spires, the towers are an imposing landmark of the Icecrown skyline, emitting a beacon of light from its pinnacle.
One King Falls, Another Rises
Champions of the Argent Tournament, led by Tirion Fordring, stormed Icecrown Citadel and defeated the Lich King's mightiest servants. Atop the spire, the Lich King encased Tirion in a block of ice, forcing him to watch helplessly as his champions battled the Lich King and his minions.
Eventually, the Lich King effortlessly killed all the adventurers with a single devastating attack. The Lich King revealed that he had been waiting for Tirion's assault all along, knowing that he would bring with him Azeroth's greatest heroes, who could then be killed and resurrected as powerful masters of the Scourge. Every obstacle he had laid before them was merely part of his test. Now certain Tirion's champions were "the greatest fighting force this world has ever known", the Lich King began to raise the fallen heroes. Fordring, calling for a final blessing from the Light, managed to break free and shatter Frostmourne with his own sword, Ashbringer. The spirits who had been trapped within Frostmourne attacked their former jailer and suspended him in the air. The spirit of King Terenas Menethil II resurrected Fordring's champions, who were then able to finish off the immobilized Lich King.
Terenas' spirit held Arthas in his arms as he died, then informed Tirion that the Scourge must always have a master to control them before he vanished in the wind. Tirion picked up the Lich King's crown and prepared to take on the burden of becoming the new Lich King when he was stopped by the voice of Bolvar Fordragon. The undead paladin sat upon the Frozen Throne, having been horribly burned by dragonfire and tortured by Arthas. Bolvar said that he no longer had any place in the world of the living, while Tirion still had duties to perform. As his final act of service, Bolvar would take the powers of the Lich King within himself, imprisoning the master of the Scourge once more and keeping the undead legions in check. Tirion reluctantly placed the crown of the Lich King on Bolvar's head. As the ice of the Frozen Throne began to envelop him, Bolvar - now the new Lich King - told Tirion to tell the world that the Lich King was dead, and as Bolvar's voice gained the characteristic echo of the Lich King, he added that Bolvar Fordragon died with him.
Sylvanas Windrunner eventually visited the Frozen Throne to confirm for herself that Arthas was dead. Upon discovering that Bolvar was now the new Lich King, she became enraged, as she feared this "puppet king" might one day use his new, inexhaustable power to twist the world to his own ends. She slammed her fist into the frozen casket around Bolvar, feeling this a defeat more than a victory. A crack began to form from her attack.