The rarity of Concealed Raven is Rare, and been equipped it takes a “Bundle” slot. At this moment the item is available for trade.
Concealed Raven is a skin for Templar Assassin. The skin was added to the game on Invalid Date, it was created by WEi-Zi.
Concealed Raven has been recently added to the game, which makes it rather popular with the game community.