What's the invitation entail? Poisoning them with some form of proto-LSD and forcing them to admit the sins of their past... which turn out to be pretty heavy indeed (murder, mostly, and lots of it). After they confess, he'll pump them up with the antidote and their minds will be clear, their souls free, etc. etc. Unfortunately, things go a little sour when the hallucinations become all too real, sending more than one of them into fits that include a snake coming out of the pants, bloody women in a bathtub, orgies, and so on.
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