The Chiseled Estate is the fortress of Cryonax on the Elemental Plane of Ice

It is a colossal structure that looms more than a mile above the frozen plain around it, and extends down into the ice of the plane about four times as far. Rumors tell of enslaved masters of magic who create horrible abominations infused with ice and cold to add to Cryonax's armies. Tales of creatures mutated by ice have emerged steadily from the compound for years. The cold of this location is especially virulent -- it is one of the "cold spots" on the Elemental Plane of Ice.