Wyldfury Garnet

The Wyldfury Garent is the most powerful of the gems formed from the elements that crystalized when the Elemental Barrier entered the earth. Found by a Keben, the Garnet changed hands several times, owing to its sentience and drive to conflict, before coming into the possession of one Abel Clan-Lost, an albino Keben who murdered his entire clan to obtain the Garnet. 
First used in the invasion of Karvesh, the Garnet destroys order around it, rendering the Rathian spellcasters useless and vulnerable to the attacking hordes.