What are the major factions in this region and what's the deal with each of them?
The Dread Emperor sets Princes to rule over planets, and then there's Grand Dukes and Dukes and Counts and Barons below those, except that also there's songs mentioning Seigneurs and Marquesses and Presidents and Headstompers and all sorts of other weird titles that Orphan did not particularly try to sort out.
They don't fight each other, whoever was in charge above them would come in and settle any arguments. Duke Greendeath is much stronger than any Count.
Merchant lords get into trade-wars and assassinate each other a lot, but they wouldn't kill a smith who was good at his job because that might upset the smith's Baron.
Does Opalyn have any allies or resources?
Everyone in her little army is dead! Healthy-Orphan was briefly angry and maybe even horrified and sad about that, before her soul got ripped out of her... oh, possibly Opalyn's eyes might be tearing up. Because of a man her memories remember sleeping with and there was a woman in camp who was really nice to everyone and she had two kids.
What's the technology level here? Does Opalyn remember anything from her previous life that could plausibly completely shift the balance of power?
Faux-medieval but with a bunch of magitek thrown in. A peasant village might hold a couple of bicycles in common, with metal wheels instead of rubber tires, so that somebody can peddle over to a nearby village on a paved road if something comes up. Healthy-Orphan doesn't know how to pave a road, probably a sorcerer does it because then the paved roads last. Scythe-blades are forged of some unstaining metal and handed down for hundreds of years.