Well, if it lets me have a good, orky waaaaaagh I don't mind!

Edit: "perhaps some ancient Forerunner-like race that left all kinds of interesting stuff around"

This makes more sense to me than a fuel source. Fuels tend to get superseded and replaced with time, after all. Super advanced tech, if carefully controlled by the GM's, would not be in danger of being pushed to the side by people seeking their own unobtanium fuels.


On the other hand, it would mean there would have to be certain relative tech caps, but again with careful oversight from the GM's its doable."


"What does everyone think about letting the GM and Co-GM(s) throw in random encounters and anomalies?"
Consult with the people they involved first. Nobody knows their own nations better than themselves, something a GM thinks might be a disaster could be almost inconsequential to a nation due to the way their technology works, thus kind of taking the entire point out of having random occurances all together.