I kinda have a theory that Lavos controlled the world a bit more than we'd like to think. The language, for example. Humans in the early ages didn't speak their own language, but a choppy version of what the Reptites had developed and spoke for years, and that was the language of the planet from then on (with the exception of Magus' spell chants). It's the Black Omen(Dream) because that's what they wanted us to call it.
The only major flaw in this theory that I see is that, with Lavos gone, languages would change and morph into completely different things like normal, and our poor heroes outside of the time stream would have no idea what people were saying to them all of a sudden.