in all ground cities, leave a garrison, otherwise, he'll move to some underground city.
Month 2, week 4, day 3 - Aunt Svetlana appeared, captured the red lower right Castle and made it green, she will breed undead; the gates opened automatically, the ones next to the Castle.
It all happened after I captured the middle Castle of Caer-Faol.
Aunt is sitting in her Castle. I defeated Nimusa on month 3, week 1, day 6, he became weak, he didn't even have time to summon anyone - he probably gave all his army to his helpers:smile02: (there were 128 broodmothers, now there are 74).
I caught him near the Deer Castle:smile10:, on the other side, he was clearing out neutrals, approaching the Fortress near the Castle, and I jumped from Castle to Castle... and that's it:smile44:.