What the..........?

[Tuidjy]

Just a random event that Marignon gets sometimes. Ermor has a similar one.
A group of cultists attacks an enemy. If they win, you get a province, a
few commanders, and a brand new, shiny enemy.

[Endoperez]

More importantly, it's an event the TARGET gets. Pangaea also has something similar, but I don't remember how maenads choose their target province. Maybe it has to be a forest or something.

[NTJedi]

The save game attachment is of no use without the map image and .map file.