[NTJedi]

Originally posted by Nagot Gick Fel:
The mere presence of Ermor or Pangaea (I don't think thare are any others) enables that kind of 'foreign invasion' event. You didn't get any 'event' message (besides the battle report) because the it actually happened to Jotunheim.

The other bad deal about this event is that even if a player successfully wins the battle against Ermor the dominion still dies and switches in favor of Ermor.