The reason I suggest it as a setting is because there are lots of small empires and yet not everything is known about the stuff "off the end of the map".
Characters can still come from a high TL civilisation but end up on the frontier up to all sorts of shenanigans.
[ . . . ]
That's exactly what I like about the period. It's a large chunk of history where there is no single, dominant superpower. The fall of ROM setting also has an upper limit to the tech level of around TL12 or so with ambient tech in the TL10-11 range and plenty of worlds with developing TL4-6 fossil fuel economies. That makes starship designs quite fun
1 and sits in the sweet spot for stuff like
Striker as well.
The campaign setting I built is set around the Daibei and Reavers Deep sectors
2, starting around 2780 AD, roughly 35 years after the banking crisis that caused the 2I to start falling apart. In this setting the local economy in the Daibei survived in relatively
3 good condition due to its isolation, and has re-booted the local interstellar economy through a treaty establishing a local interstellar trade currency (new credits).
- The Daibei government is starting to fall apart, with Vilani separatist movements being the main driver of political unrest.4
- Drexilthar is home to a minor human race and is finally rising as a local economic power now the colonial boot is off the back of its neck (think something like a BRICS country). With a population of 2 billion or so, it is by far the largest single local economy in the Deep sector. Ilthari expats, originally drafted as colonial labour, make up a significant fraction of the population of the worlds in the subsector and nearby regions. Ilthari Mafia are a significant thing in the region.
- Caledon and the nearby worlds settled by Charles Stuart Scott et. al. are still a minor economic power but are aligned with the Daibei as they consider themselves to be primarily Terran ethnically and are suspicious of the Ilthari. To save money and distract the Ilthari and Aslan clans, the Daibei has transferred a significant body of naval assets to Caledon, but the Caledonians can't afford to run them any more than the Daibei can. There is a loose economic federation in the Caledon and Scotian Deep sectors but the Principality of Caledon won't be formally founded for another 1,000+ years.
- The other two major powers in the region are the Yerlyaruiwo and Khaukeairl clans, who have had jump tech for around 2-3 centuries and have had a presence in the rim/spinward sections of the Deep for about 150 years.
- The Saie are still around, although in smaller numbers. The civil war that destroyed their homeworld left some asteroid colonies in their main system along with a handful of breeding colonies5 on habitable worlds in the region.
- Most of the other worlds in the Deep are developing economies, and the region is showing its later-to-become-famous lack of rule-of-law due to the fact that nobody has the resources to run significant naval patrols in the region.
I decided to avoid filling the region with minor interstellar polities and left most of the worlds independent, precisely as this gives the region an uncivilised, frontier vibe. I'd argue that GDW would have actually been better off doing a fall-of-ROM setting like this than doing the Schism and Virus, but I wasn't there at the time so I can't really speak for MM et. al.
1 At TL11-12 you really can't have your cake and eat it with starships in the way you can at TL15.
2 Although not called the Reavers Deap as 'Reavers' is a term that won't be coined for another millennium or so.
3 'Relatively' is relative. Good condition means 'Economy hasn't totally collapsed like the core.'
4 More conservative elements of Vilani society still regard the Terrans as a barbarian invading force occupying their homelands, just as the Russians regarded the Mongols in this way while they held the Golden Horde.
5 IMTU I gave the Saie a life cycle involving a parasitoid larval stage, something along the lines of Alien Xenomorphs or the Prawns from District 9. Naturally, humans would find this rather gross, giving a potential motivation for a subsequent genocidal war that finally wipes out the species and which might be glossed over in the official histories. By Cleon's time this would be ancient history, with the Saie having 'mysteriously' disappeared with no real record remaining of their existence. Perhaps some old media still exists, but it's long perished and nobody can read the format anyway.