Not so sure on new lower level item boosters, there definitely seems to be a point to the difficulty in raising magical abilities. However, I think that since there is a Scepter of Corruption with +3 Death, that it would be interesting if there were an artifact for +3 to other paths as well. I think it should generally compete with other boosters for that path, just as the Scepter replaces a Skull Staff.
Crystal Crown (head) +3S
Clogs of the Mountain (feet) +3E
Robe of the Oceans (body) +3W
Sledge-o-matic (2h mace) +3B
Apollo's Crest (head) +3A
Wild Reaver (2h axe) +3N
Crown of the Infinite Blaze (head) 3F
Something along those lines.
Anyway, I think as an artifact, those wouldn't be any more (over)powerful than the Scepter, but would give some interesting options.
Also, I think it might be interesting to have fully cross-path item boosters. Such as an item that takes 15N to forge, that gives a Death boost. A way that people who are very strong in one particular path could diversify a little bit, just a little more easily than they do now. Of course, there is the issue of trading items in MP which would enhance overall availabilty..... But I think people would learn that it's best not to spread that around. What gives you a LITTLE help diversifying into something you otherwise had trouble with, might give someone with already strong access an incredible advantage over you.