Jessica, yes, I sometimes jokingly call her my most challenging boss, XD. And before, she had a special ability to cast Divine Retribution after each cast of Light, and the AI cleverly (this wasn't intended) would buy an army and even from the third town.
Rebuilding the Necropolis town allows you to get an alternate upgrade, yes. Plus, it greatly boosts the number of Thanatos. I can't remember what the idea was behind the upgrade restrictions, but I guess I wanted to say something with it.
The variations in the ending are just a bit of showing off, which didn't go any further in my plans. In the latest update, I added a dialogue with a hint when capturing the second town of the blue AI, and before that, most people didn't answer on the forum and didn't complete the true ending. And even earlier, Kirana couldn't be bypassed, hehe.
Well, thanks again, and good luck with your adventures with Arantir! And soon, by the way, the third map in this series will be released. Thanks to Khottabych for the motivation and power.