Frostmourne was the runic blade that Ner’zhul, the Lich King, had cast from the Ice Throne, with the intention that Arthas Menethil – his potential unconscious host – would discover him on the continent of Northrend. It was used by Arthas, the new Lich King, until it was destroyed by Tirion Fordring following his defeat at Icecrown Citadel.

A gold-plated replica of Frostmourne’s guard is now on display at Dalaran, in place on the statue of Tirion Fordring. The shards of the weapon are used in Legion 18 × 18 World of Warcraft: Legion to forge Icebringer & Soulreaper artifacts for Frost Death Knights to fight the Burning Legion.