NAF – New artifacts with unique properties.

I see two approaches to this issue: 1. Make all artifacts that are in some way tied to a specific faction useful for everyone (for example, increase the bonus to spell power on the Rune of Flames, as suggested in the post above, so that the rune becomes useful not only for Dwarves). 2. Create one artifact tailored to each faction (for Necropolis, it's the "Amulet of the Necromancer"; for Dwarves, it's the "Rune of Flames" without a bonus to spell power; for Inferno, it's the Book of Gorath Raell; the rest need to be invented).