comeback of defeated factions?

[Shadowwalker]

Exactly.
That's the main point why I don't want a "civilized" faction to have the ability to re-emerge.
Nomads, Gauls or German... yes. Caesar got some pretty surprises out of the fact that it didn't suffice to conquer the settlements since his opponents just left them and walked away.

It would still be a very annoying feature (at least to me) but it wouldn't be a fantasy feature.
If Seleucids or Macedons would horde ... well, I believe, such features are to expect in EF (Europa Fantasmagorum) but not in EB.