The rarity of Grasp of the Riven Exile is Mythical, and been equipped it takes a “Bundle” slot. At this moment the item is available for trade.
Grasp of the Riven Exile is a skin for Weaver. The skin was added to the game on May 16, 2018, it was created by Keanhotshine.
Grasp of the Riven Exile is currently a rather popular skin, which is often seen in the game.