Heroes 6 - Discussion

the main thing is to have more artifacts; they could be made specific to certain races. Or create gear that is only suitable for mages (hero class) and only for warriors.

Not great.
Because sometimes in a battle between a mage and a warrior, the mage lives _significantly_ longer with a purely "warrior" item, for example, a sword with +6 attack.
And vice versa. The Book of Magic is generally indispensable for everyone.

Hmm. Machete, you just gave me an idea...
Artifact sets - everyone can wear them.
A complete set - everyone can wear it.
BUT! If a hero of a specific race wears the set, they receive additional bonuses in a certain amount. Not too imbalanced, but enough so that, for example, it makes sense to give the "Elven King's Armor" to an elf hero as soon as possible.
Well, that's simpler - a specific race in the artifact bearer's army receives bonuses on top of the set's bonuses.