Can we get a minute by minute analysis of exactly what happened to the Burmek Commonwealth?
Minute by minute? Well, I don't want to write a whole novel, so how about a general overview?
The Burmek Commonwealth was founded and ruled by two divines, Okatogg and Hulushka. They used their divine influence (and brute force...) to wrangle all the scattered tribes of northern Wokina together into one big government.
The Burmek Commonwealth grew into a major world power very, very fast due to its abundant resources and divine leadership. Before long, it had not only become a Great Kingdom, but one of the more advanced ones at that. Other Great Kingdoms had gotten heavily involved in its economy which only helped it thrive more.
Zareen Empire became the Commonwealth's greatest ally and traded a lot of its tech for Burmish resources.
Burmek was on track to become as advanced as Zareen. However, this kingdom had grown way too fast and did not build a stable foundation beneath its greatest holds. Its military and infrastructure were spread way too thin.
As the Commonwealth's technology advanced, the local nymphs began to push back hard. Okatogg and Hulushka retaliated by waging war against nature itself, planning to beat all the local nymphs into submission the same way Zareen had so they would have the freedom to advance indefinitely.
Due to poor planning and the lack of foundation I mentioned above, this war went really bad for Burmek really fast. The nymphs rose up and obliterated them pretty much overnight.
The Burmek Commonwealth collapsed and disappeared just as soon as it popped up. Zareen said "fuck that shit lol" and pulled out of Wokina altogether. Meanwhile, the enraged nymphs fortified the land with hostile flora and fauna so that foreign kingdoms couldn't colonize it even if they tried. This is how the gull-snatcher population got so out of control: the nymphs started feeding them sacrifices regularly.
Okatogg and Hulushka have been trying to raise their kingdom up from the ruins ever since with no success. Because one, everyone hates them for plunging the kingdom into ruins in the first place. Two, they're total idiots who just happened to get lucky the first time.
TL;DR: Burmek picked a fight with nature, then brought a knife to a gunfight.