Heart of the Night

Added 6 minutes ago
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well, you could tweak the abandoned Turgal in the underground, that's true. But if you do that, you need to adjust the rest as well. I think then you should tweak 3-5 Necromancers and Baal, not in terms of troops, but in terms of their behavior in battle; buff the last 2 battles of the map. Maybe something else?

well, the Engineer is fine as he is, you don't need to touch him, and the same goes for Gilva, because she's a pain and it's already tight there. But Orris, Clemira, and Mardakor -
the main thing is not to overdo it, so that we don't lose our initiative. If we lose it, it will be much worse. It would also be good if Clemira didn't lower her Defense below what it is now, but you can think about the rest. But without a counter-spell, I wouldn't even go near her, it's not worth it.
Mardakor's speed is also tight, maybe by one square. It's very unpleasant - he casts spells randomly along with his beam, and you have to replay to prevent him from casting it... but then again, he's the last one, and losses there aren't important, so...
that is, if you don't use the ideas that I came up with and described above, it will be difficult, and I doubt that Chaos will be able to handle it, the scope narrows again. But if Greta is just a standard elf, that's fine.
we need to test, will old saves work on the new version?

the last 2 battles are where Greta is and the final battle? In the final battle, if you don't realize that you need to throw swords at him like a wall, it's difficult. I spent a long time trying different combinations, and mass berserk is terrible. As for where Greta is fought, that's up to you. If you don't strip her and give her a bunch of weak units, it will be difficult, I think. She will cast Heavenly Shield on everyone, and I didn't even try. Baal, when Karl fights him for the first time, there's nothing particularly difficult there, but again, you need to do it without losses.