The rarity of Tools of the Hellsworn is Mythical, and been equipped it takes a “Bundle” slot. At this moment the item is available for trade.
Tools of the Hellsworn is a skin for Warlock. The skin was added to the game on October 12, 2015, it was created by Sylei.
Tools of the Hellsworn has been recently added to the game, which makes it rather popular with the game community.