question:  What message for humanity does the author wish to communicate, regarding the fate of the Ryzgas?
context: 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. While she waited he spun a dream, attaching it to the crags that loomed over the pass, and to the frozen ground underfoot. 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. And before very long, I'm sure, I would have performed some deed which Groz would recognize as a worthy exploit, and would thus have healed the feud between our families. I did not see the sleepers, nor will any man until they come again, but I met their sentries, the sentinel machines that guard them now as they have for two thousand years. "But they were such a race as the world has not seen before or since. There were tyrannies before the Ryzgas, there was lust for power, and atrocious cruelty; but such tyranny, power, and cruelty as theirs, had never been known. They laid the world waste, stripped it of metals and fuels and bored to its heart for energy, poisoned its seas and its air with the fume of their works, wrung its peoples dry for their labor ... and in each of those four generations they launched a ship of space. They were great and evil as no other people has been, because they wanted the stars. "Because of them we must build with dreams instead of iron, and our only fire is that of the Sun, and even now, two thousand years later, the Earth is still slowly recovering from the pangs and poison of that age. And we—we too are a remnant, the descendants of the few out of all humanity that survived when the Ryzgas' world went down in flame and thunder.
output:  We should be grateful for natural gifts bestowed by the Earth, and not try to seek more beyond life's simple pleasures
options:  While social stratification may benefit one group temporarily, eventually it will shatter social institutions  Humans are doomed to repeat history until they wipe out their entire race  We should be grateful for natural gifts bestowed by the Earth, and not try to seek more beyond life's simple pleasures  Actions and decisions made in the name of love can breed destructive hatred