Welcome to the eighth entry in the series Original Scenarios Resurrected, wherein D&D scenarios from the 70s and early 80s are republished with the permission of the authors, usually together with extra contemporaneous material. Today is the turn of The Devil's Quagmire by Andrew Ravenscroft, with illustrations by Quentin Manley. For all entries in the series see here.
The Devil's Quagmire, published in The Beholder #16 in June 1980, was the last of Andy Ravenscroft's three published D&D scenarios, all illustrated by his friend Quentin Manley. Thanks to Andy I've already republished Clearwater Caverns and The Temple of Psaan, but in this third effort he really raised his game both in the quality of the content and the scope of the adventure.
"Throw this in your campaign RIGHT NOW."