Riombara had to face quite a few undead and monster units last week as well - 5-6 total, most at a strength of around 2000, one stronger than 3000. Did play hell with a carefully orchestrated refit cycle...
Before that there was not a peep of them to be seen for 3-4 weeks. With the current resurgence I (as player) speculate that there was a bug somewhere that has been corrected and is now serving us with those units we would have seen during that time.
And aye, please let there not be a new invasion right now...times are far too interesting for that.
