The rarity of Toll of the Fearful Aria is Mythical, and been equipped it takes a “Bundle” slot. At this moment the item is available for trade.
Toll of the Fearful Aria is a skin for Phantom Assassin. The skin was added to the game on June 22, 2015, it was created by Anuxi.
Toll of the Fearful Aria is currently one of the most popular skins, but it is rarely seen in the game due to its high price.