God damn it, i think that the sig is there to cloud our thinking. Best clue that i could see was a positive hint that "it's way off geographicaly" from nabatea, so we can exclude north-eastern africa, fertile crescent and arabia. Then, i think it should be a faction that was, at least to some extent, expansionistic and ifluental. Also, there is IMHO need to balance some factions without much enemies in their neighborhood, such as Sweboz and Sauromatae.
As for history, damn. Not nearly educated enough to make wild-guesses, but some of mine were: 1. Xiongnu, right next to Sakae, at 209bc aready had a solid nomad state, and were aggresive to in some hipotetical way expand to the west, but, they didn't, so i don't think they have a good case. 2. & 3. Proto-slavs & Proto-balts. Way beyond EB timeframe, but certainly were in central-eastern europe in that time, and they surely were numerous enough to be distinct factions, nor did their technology undergo any serious revolution to the time of our first knowledge of them. Also, good way to bring more fun to european steppe scene. But still, their case is on a hear-say basis, and doesn't have a bright EB future as far as i can tell. 4. Central asian nomads, massagetae or someone like them (historians, feel free to unleash your anger if something is blatantly ignorant on my side) 5. Balkan factions: Scordisci, Illyrioi, Bastarnae are all fine, and might be a great way to slow down Getae and Epeiros, with a good historic ground IMO.
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