I think some of the currently available artifacts have some problems:
Improve usefulness of Lances/Shields
There are few instances where you can predict the class of the opposing creatures (nemesis team, 1 sigil creature). It would be nice if you could change the class of the opposing creatures either via spell or trait. An
offensive copy of Morph:* spell might be too powerful, but single target spells or an AoE that switches enemies to a random class or a trait that lets you exchange your class with an enemy creature…
Increase primary stat for pure artifacts
Swords/Armor/Boots/Heavy Shields/Necklace should give twice the amount of stat compared to artifacts that give 2 stats. Currently you get over 25% more of stats from an artifact with 2 primaries.