atlant108
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In RPGStats, look for a line called ArtefactSet or ArtifactSet, something like that.
But I warn you right away: you can't change everything there. You can change things like the stats that sets give, maybe some other minor things, but you can't fundamentally change the bonus from a set.
In general, the idea is interesting. After all, there are some rather useless artifacts. Can they be turned into useful ones by changing their characteristics?