1. Why?
2. For personal use, and it's not overpowered.
3. Is it possible to make an artifact unique to each faction, and is it possible to add a unit's ability to the artifact and tie this artifact to a specific upgrade or faction?
4. Who is making the new upgrade (EWA)?
2. Until you tell me what you want, I still won't be able to understand what's so special about it. And the expression "for personal use" is unclear. Does this mean that this artifact should only be made for you, and not included in the mod version "for everyone"?
3. Yes, it is possible to make the artifact have different effects on different factions. I don't understand what you mean by "how do you want to tie a unit's ability to a hero?" Give an example.
4. It's better to ask in the EWA topic. But since you asked. Fauch made the creatures with someone's help, and 7 more creatures were taken from the RedHeavenHero campaign "Empire of the Unicorn." I don't know who made the creatures for this campaign.
Added 1 minute ago
Can we play a single-player map, just one player against a weak AI, for example? ;)
Reserve 60 artifacts and leave 40 more for other needs, for example. Too many, on the one hand, is not always good. But I would like to add one more byte. ;)
Regarding 65535 IDs, I agree that this is too much, but no one is saying that they all need to be used :D