[X] Destroy The Evil Items, Decide for the others on a case-by-case basis.
-[x] "Ordinarily I might say to destroy them all, but we have a demon invasion coming. That only increases the importance of destroying the evil ones, but we should at least consider keeping a few of the purely destructive ones. We should try to make sure they can't be used during the war, though."
[X] Have Karen point out all the evil artifacts to you
-[X] All of those have to go; destroy them
-[X] Once that is done, have her select a few of the weakest artifacts; you will keep those, just in case another big problem comes around and you are busy
--[X] Destroy the rest