Crown of Eternal Winter

Crown of Eternal Winter is a cosmetic helm.

Source
This item is available for purchase from the shop for $15 or €15. It was released on July 17, 2013.

With the See You Later Bundle on December 20, 2019, this helm was available at a discounted price with other items. On January 19, 2019, the helm is no longer available for purchase as it entered hibernation in the Blizzard Archive.

Blizzard Shop
''Recovered from the frozen battlefields of Northrend, the Crown of Eternal Winter enshrouds your character in an icy visage of death. Now, you can adopt the look of an elite member of the Scourge, but without the inconvenience of undying bondage in the service of the Lich King.''
 * The coolest headwear ever