 Which lingering effect of the Ryzgas' downfall makes life challenging for people like Var and Neena?
But its outward perils could not compare with the Ryzgas themselves, who slept within, ready to wake and conquer.... Now, if her father and his kinsmen overtook them, it would be death for Var, and for Neena living shame. 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. Warming to the old man now, Var sketched his and Neena's history briefly. The Watcher was broodingly silent; his eyes shifted to Neena, where she nestled by Var's side. Neena returned his gaze without flinching; then she looked sidelong at Var, and her lips curled with a proud and tender mockery.
 The Ryzgas destroyed or used up all of their materials, so Var and Neena's people can only construct things with their dreams
 The Ryzgas littered the planet with wreckage of their old creations, which renders it inhabitable  The Ryzgas destroyed or used up all of their materials, so Var and Neena's people can only construct things with their dreams  The Ryzgas manipulate the entire planet through their Control Center, so all outcomes are predestined  The Ryzgas toxified the environment, which has caused a genetic mutation among their descendants