How Procellia ends

Since Procellia played a big part in my nations, and pretty much every other nation here's story, I take it upon myself to explain IC why it doesn't exist anymore. Now there are already people taking part of Procellias claim which, IC would not happen so fast unless Procellia had a revolt and split into many different territories. This way we can explain why Procellia as a single nation disappeared but also why lots of other nations, which they undoubtedly will, sprung up in the area previously occupied by it. Of course this has it's downside as any nation that wants their plot there would have to adopt at least one aspect of Procellia traditions, say demonism and or the appearance of the race but that's all I have so far so yeah.
If you have any questions or other suggestions post them below.
But we can't just cut Procellia out of the lore like it never existed because if we did, no Great Meeting, which means Ranxiagir didn't get overthrown, which means Sasaufe didn't take over, there was no Soltek Pact, Kauzka is still named Felinius Paradisum (Please no) and it's not in anarchy, the Mekselia Summit may not have happened and many other things as well. 
We have to do something. 

P.S if you are new and have no idea what I'm talking about don't bother asking just let us take care of it.