It wouldn't be a good idea to kill the crypt arch because he is the only person that knows how to decrepit your findings and if you don't like hose then dismantle them but with no cryptach you get nothing so you can't dismantle them so you can't upgrade weapons or armor. Keep him until we don't
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Going by his track record, he should be demoted to Apprentice Rahool at the very least. He is not ready to be a Master level. We need to speak to Tower Speaker on this.