Cold Forged Hammer

Cold Forged Hammer is a rare mace and a reward for fighting in Alterac Valley.

Source
This item is a reward from the Horde quest Hero of the Frostwolf which starts with Voggah Deathgrip in the Alterac Mountains, and the Alliance quest Hero of the Stormpike which starts with Prospector Stonehewer in the Alterac Mountains. You can directly complete these quests after you receive them, but you must have completed the quest The Battle of Alterac to get these quests.

Trivia

 * Cold Forged Hammer is a Rare Weapon card in the World of Warcraft: Trading Card Game's Drums of War set.