Rexsar
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There are 4 heroes there, plus 2 bosses. My advice is to try playing as a Warrior on the second map. It's also quite challenging there.
The AI is too dumb and develops too slowly when playing as a Warrior.
If in the first part, the AI was afraid to attack the Castle when playing as a Hero and moved towards the Yellow faction, what will happen when playing as a Warrior? =))
In the second part, the army that the hero-AI has is acceptable. And I can defeat it with some losses, with about ten Knights and the Lords defeating the Demons. That's nothing. But Chaos...