It also sets gears into motion in my head about these ancient empires. The giants, the 'tieflings,' and now, perhaps, some kind of dragon-dominated empire that was mostly dragonborn and their full draconic masters. As they disintegrated, the empires dissolved into fractious client states, which shattered into a handful of city-states and an anarchic, unbordered landscape between them. Your points of light. Plenty of room there for old guard soldier units turning first into mercenaries as the governments they once fought for failed...then finally becoming bands of raiders when no one could or would hire them anymore.