Publisher's blurb: Open these pages and learn about the madness-fueled howling tunnels in the Windswept Depths of Pandemonium! The mythical Codex of the Infinite Planes is a massive book containing information on the very planes of existence. Too many for one document to tackle, so it's been divided up into volumes covering individual planes. Crack open the Codex in this continuing volume and learn about the Windswept Depths of Madness, with dangerous windstorms, claustrophic tunnels, and an omnipresent madness strong enough to drive the toughest mind to utter insanity. Pandemonium is the home of the exiled and lost, but there are still plenty of adventure possibilities to be had across all four of its dangerous layers.