The rarity of Relics of Ribbi'tar is Mythical, and been equipped it takes a “Bundle” slot. At this moment the item is available for trade.
Relics of Ribbi'tar is a skin for Witch Doctor. The skin was added to the game on October 14, 2015, it was created by mig.
Relics of Ribbi'tar has been recently added to the game, which makes it rather popular with the game community.