Tomb of the Five Crowns

From the PDF: Eons ago, the demon lord Abraxus was summoned to our world by a cabal of wizards. The demon lord slew his would-be masters but found himself trapped deep in their dungeon and unable to return to his Abyssal domain. Abraxus, Duke of the Mercury Seas of Yorgash, summoned a cadre of faithful demons to free him, but they were imprisoned alongside their lord. Now, the summoners’ dungeon is the prison domain of the fiends. What heroes are brave enough to face and defeat the Blood Demons? An adventure for 4-6 characters of levels 6-8.