dredknight
Yesterday, I didn't have time to figure it out, and I still don't.
I just realized that it's related to the artifacts on the hero.
I'm uploading the save file and the map.
What I did: I removed all removable skills from the hero, Winrael, through the mentor, except for "Secrets of Light" (+2 knowledge) and "Cult Leader."
After retraining, I check the hero's stats and see that the knowledge is lower than it was before.
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