The rarity of Bitterwing Legacy is Rare, and been equipped it takes a “Bundle” slot. At this moment the item is available for trade.
Bitterwing Legacy is a skin for Dragon Knight. The skin was added to the game on November 29, 2017, it was created by MisaMisa.
Bitterwing Legacy is currently one of the most popular skins, but it is rarely seen in the game due to its high price.