I think you know about this artifact http://ru.ashan.wikia.com/wiki/Горада_Раэль
In general, if the number of artifacts allows, you can do the same with a mod for new artifacts as with a mod for new heroes (not only invent your own artifacts, but also add all the artifacts that were in Ashan throughout all the games dedicated to this world - that is, all the artifacts from Heroes 5, Heroes 6, and Heroes 7).
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