I've been poking around trying to find out if anyone has already posted about this, but my google-fu is failing. I was hoping to find something that talked about how to use some of the 4th edition artifact ideas in Pathfinder. I especially like the scalable nature of the concordance idea.
Essentially, I am looking to design some unique magic items/artifacts that will play a pivotal role in the game I am running. I'm not exactly sure how to design something that comes across as powerful without being overpowering.
Anyway, advice of any kind would be immensely helpful. :)