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I don't believe acid immunity is necessary. It just looks good, as acid resistance is basically all you need. Trying to hunt a rare and dangerous early game monster hoping for a rare corpse on par...

Your case would be an easy decision. Definitely an useless item.
Just thought that Ultra Heavy Scalpels (8s) would be quite amusing :D
Slugs and Black Druid are the main reasons to avoid the Druid...