The Wiles of Malygaash

From publisher blurb: The Wiles of Malygaash is a 1-3 session (or about 4-12 hours, depending on roleplay and combat duration) adventure for 5 12th-level characters that takes the adventurers from a ruined, blasted settlement through a portal to a hellish torture chamber used to create barbed angels and finally on to the devil Malygaash’s lair to put a stop to his invasion plans. This 12-page PDF contains all the information you need to run the mini adventure, including three new monsters, two magic items, and three encounters.