Quote Originally Posted by Felis View Post
There was no "dark and light" balance thing in the CT story
Not explicitly, but you missed Doga and Unei's explanation for why the Allagans resurrected Xande in the first place. They built their Crystal Tower to provide all the energy they ever needed, and it did. It did its job so well they no longer had goals to strive for, leading to the slow but steady decline of their civilization. Xande, our metaphorical "darkness," was revived to counter out the "light" that had stifled their growth as a civilization.

It's also meant as a reference to the decadence and decline of the Roman Empire, but it seems rather odd that they went out of their way to specifically point out the Tower as a root cause of the problem in a story that ultimately wanted to pass it off as a "light" that should be given to the people of the future. Just my two cents, but I have done the legwork on this one.