Do not upgrade the Carsomyr. The changes to it will be rather small, not a big difference, just the +6 THAC0, while upgrading the Purifier will give much more additional properties to it. Simply look at what you will get - same ole Carsomyr, just +6 THAC0 (+5 is QUITE enough), or Purifier which will gain quite a bunch of improvements? I'd upgrade Purifier ANY DAY. More useful.
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