The rarity of Cry of the Battlehawk is Mythical, and been equipped it takes a “Bundle” slot. At this moment the item is available for trade.
Cry of the Battlehawk is a skin for Sven. The skin was added to the game on February 4, 2016, it was created by liangbinge.
Cry of the Battlehawk has been recently added to the game, which makes it rather popular with the game community.