Building a world is a hard thing. Very hard. It's easy to look out your window and describe a world that way with whatever improvements you need to give it (advance it enough for sci-fi or the reverse for fantasy) and build from there. At least you'll have something to build off of as far as I'm concerned. But how does one describe a world that's fallen into corruption and decay? No, not the political decline or social decay. No, I'm talking of the pure science fiction type in that of good/evil, angels/demons styled decay and corruption? Imagine a world in which it starts like a futuristic version of what is Earth now, but one in which they are subverted, perverted, corrupted, mutated, and countless things that take it from what was the far off Earth type futuristic world, to one that's so far down the path of (not completely, but enough for you to visualize it for me) a "Hell on Earth" type setting. Not really the "Fire & Brimstone" styled description that we're used to, but still in theme of that kind of damnation. Thoughts?