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I completed it on Hard difficulty. It was quite challenging. I went straight to the right, and the first enemy, Kalindra, appeared from there; I defeated her several times afterward. To deal with the annoying Naga, I ventured east, captured one town, and later a second one by the lake. After that, the raids stopped. I then needed to capture the town further down the rapids, past the whirlpools, but it wasn't that important anymore.
I still don't understand what happens to the hero after visiting the whirlpool. In the fifth week, the army decreased by a few creatures; maybe it's the same in the sixth week. But there was no shortage of troops; the neutrals scattered and joined me.
After collecting and exchanging enough crystals and re-dedicating the altars, I entered the gate, took the town, jumped into the spirit gate, and killed the Naga-shapeshifter. There was a structure on the map, surrounded by gates (not Flame Gates), and it remained unexplored. It seems it's for a Blood hero.
I especially enjoyed the battles at the beginning of the game. A small group of troops, led by a hero who is no longer a novice, can pass without losses, which is particularly satisfying.
It's advisable to collect artifacts at the top, near the Orcish neutrals; some of them, which are collectibles, remain for the next mission!:smile20:, as does Shantiri's disc!!!:eek:
The lack of crystals is the only difficulty in this mission.