The StonecoreIntroduced in Cataclysm
Within the Temple of Earth, locked in the heart of Deepholm, lies the Stonecore. It was inside these caverns that the Twilight's Hammer toiled over Deathwing, hammering elementium plates to the Dragon Aspect's body in an attempt to hold his tormented form together. With his renewal complete, Deathwing ascended into Azeroth, shattering the World Pillar and destabilizing the region of Deepholm.
These fanatics revere Deathwing as an agent of destruction, and his former lair as a sacred place. Yet, rather than accompany him into Azeroth, a massive number of cultists have gathered at the Stonecore. What they hope to call forth is yet unknown - but Deepholm, already shattered near to the point of collapse, cannot afford their success.