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I've looked at different mods, but this one appealed to me more.
Waterfall_13 thank you very much! For some reason, I didn't think to check this file; I saw the file with the Avatar of Death and thought the others were also related to monsters from the campaigns.
There are many parameters in the default stats (it's a pity not all of them).
You can adjust some hero specializations, some skills and abilities of both heroes and creatures.
Overall, there's plenty to explore.