[johnny]

I also don't like to roleplay based off outside media, and prefer to make up an original plot.

Both the suggestions sound interesting. The first one sounds like it'd be the most accessible to people. The Egyptian one, while cool-sounding (I love Egyptian mythology) might require too much research and that could bog down the roleplay. I like the combination of destroyed/scarred earth plus survival/powers. It's a simple premise, but a really sound one.