The rarity of Noble Frostheart is Rare, and been equipped it takes a “Bundle” slot. At this moment the item is available for trade.
Noble Frostheart is a skin for Winter Wyvern. The skin was added to the game on September 1, 2016, it was created by Toasty.
Noble Frostheart has been recently added to the game, which makes it rather popular with the game community.