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the easiest way to get poison sacs is doing the ioeprey in gathering hall your almost gaurunteed 2-3 poison sacs if you carve their chests
or an even EASIER way (if you're on 4*, so if you do it in the GH you are guaranteed to lose (if you are a n00b) with the Ioprey) is doing the one where you gotta kill 3 of them, there you'll have enough