Eye of the Storm (crystal)

The Eye of the Storm is one of the seven shards of the Ata'mal crystal. It was in possession of Velen after the fall of Shattrath and presumably still is.

Trivia
The crystal was supposed to appear in-game as a quest item The Eye of the Storm, retrieved by the the warlocks Kanrethad and Jubeka in the Black Temple, and then delivered to Wrathion in Pandaria by the adventurer. However, these plans were scrapped, and the item retrieved was replaced with the Empowered Soulcore.