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I'll add a little something, just in case someone doesn't want to bother with art or leveling up, or the author wants to add something similar. The editor is incredibly unfriendly – I only removed the dodge ability and changed the starting bonus to gold so that all artifacts can be equipped immediately; the artifacts on the map haven't disappeared, just in case I break something. Honestly, I haven't checked what will happen when the main hero is changed; the idea is to avoid having to worry about artifacts and skill choices during leveling up; everything happens automatically.
I was a little surprised that there wasn't an option to give super skills to the main hero; I couldn't give the Devil's Chain or Fire Wave, and for some reason, you can't get the length of the tables using standard functions like table.getn, and you have to specify the length of the existing ones in a clumsy way.
Otherwise, there's a small issue in the current version: scrolls and wands change the spell when passing through a portal, but I don't think it's worth the effort to deal with it.