So, this isn't fully formed yet, nor do I know if this will ultimately serve the overall fund of knowledge/be useful. But I wanted to get some feedback on the idea rolling around in my head.
The mythic background count. Its an attempt by me to sort how/why mythic threats appear, and the impact of mythic characters on a setting. Ala "Does Batman curb the craziness, or does Batman ATTRACT the craziness"
So from an external perspective of the setting, mythic background count accumulates usually very slowly, and gets worse as time goes on if left unresolved as the threat increases in potency.
Like letting an evil dragon maintain and keep a lair over the centuries, its just going to get worse.
The same goes with mythics, but also accelerated with a convergence of higher level fate-weaving, artifacts or higher order beings running around.
The normal game allows for the idea that if you set down roots, and make enemies, those enemies can come calling on your home/city/fort/whatever when you're not there. Usually with the way CRs work you can still plausibly have your NPCs hold stuff off when you're not around, at least to the point they can call you back. On the other hand, mythic rated threats are potentially "Wipe out normal army" level and "eat your entire leadership roster you left at the castle". If anyone watched Hercules the Legendary Journeys you notice that when Herc settles down for a season (starts a home, tries to be a good dad), eventually Badness on an Epic/Mythic level occurs. As such, he tends to move around alot, dealing with mythic threats but also not sticking around long enough for his area to become a new target.
So back to the mythic background count:
I was thinking of an abstract idea of having a background count that gives/explains why regions pop up, how they can be managed and a mechanic of 'suppressing your mythic qualities' to have less of an impact on the background count. Kinda a mechanic to roll in why a pissed off mythic threat doesn't just roll into your hometown/kingdom beyond having to rely on the GM to not be a douche. It also then allows mythic chars to manage their impact a bit, so if they do want to stick around and draw a mythic threat so they can 'reset the count' to make the region safe again for a bit, they can do so.