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Does anyone happen to know where I could find the derails for the Purge Chaos Marine detachment outside of the super expensive book?

This is Proposed Rules, it's for discussing homemade content. I can construct you a variant on the Purge detachment (or a Purge/Death Guard-esque supplement with a supply of relic Phosphex weapons) if you really want but I don't think we're supposed to reprint copyrighted material in its entirety on the forum in general and almost certainly not in the section that's for rules GW/FW didn't write.

Sorry, I didn't know where to post it.