World of Warcraft Frostmourne Keyring. Frostmourne is the rune blade held by Arthas Menethil whoe later becomes the Lich King in the World of Warcraft Expansion Wrath of the Lich King. Sword is metal with a silver hrey colour and is 11cm long not including keychain. Perfect gift for all World of Warcraft fans and collectors. We also sell mini weapon stands that look great with all our weapon keyrings. Check the keyring section in our shop or ask for details.