 Why were the Ryzgas not afraid that someone might enter their mountain?
But its outward perils could not compare with the Ryzgas themselves, who slept within, ready to wake and conquer.... Both had heard of this place, and the ancient who lived there to keep watch on the Ryzga mountain, as a part of the oldest legends of their childhood; but neither had been here before. Var saw with some surprise that all the walls were sheathed in ice—warm to the touch, bound fast against melting by the Watcher's will. Behind them began a tinkling of falling water, thawed from the glacial ridges above to descend sheet-wise over the cave mouth, freezing as it fell into lengthening icicles.
 They were convinced that no one would be able to penetrate the mountain without advanced technology
 They did not believe that anyone would want to return to a terrifying society that the Ryzgas left behind  They commissioned the Watcher to spin dreadful dreams about what might happen if people attempted to do so  They thought that their descendants would eventually die out without access to raw materials  They were convinced that no one would be able to penetrate the mountain without advanced technology