Legendary Frostmourne, the famous sword of the fallen paladin Arthas Menethil, the blade that has marked an era. Frostmourne hungers...

Frostmourne was the runeblade that Ner'zhul, the Lich King, thrust from the Frozen Throne, intending that Arthas Menethil — his unwitting potential host — would discover it on the continent of Northrend. It was wielded by Arthas, the new Lich King, until it was destroyed following his defeat in Icecrown Citadel. When Ner'zhul was transformed into the Lich King by Kil'jaeden, his disembodied spirit was shackled to a magical suit of armor as well as the runeblade Frostmourne, and trapped within an icy tomb called the Frozen Throne. Both the armor and the blade were crafted by the Nathrezim for the purpose of containing and controlling the Lich King. Some time after the Burning Legion's defeat at Mount Hyjal, the demon hunter Illidan Stormrage used a powerful spell to attack the Frozen Throne, where the Lich King was imprisoned. Though the spell was unsuccessful, it widened the crack through which Frostmourne had been thrust, and the Lich King's power began to wane, so he recalled Arthas to Northrend to aid him. Arthas defeated Illidan and ascended the spire of the Frozen Throne, then plunged Frostmourne back into the ice and donned the helmet sealed within, becoming the new Lich King.