The rarity of Eternal Purgatory is Rare, and been equipped it takes a “Bundle” slot. At this moment the item is available for trade.
Eternal Purgatory is a skin for Terrorblade. The skin was added to the game on October 9, 2015, it was created by The Horse Strangler.
Eternal Purgatory has been recently added to the game, which makes it rather popular with the game community.