His name has inspired fear in legions of heroes, and his cult has lurked in the dismal reaches of the world for countless ages. His minions are savage and feral, his worshipers vile and wretched. He is Demogorgon, and his temples are nightmare realms haunted by primeval menaces and hateful legacies from a time when the world was savage. And now, a vengeful death knight has discovered one of these lost temples—will the PCs aid him in his dark quest for revenge, or will they fall before the awakened host of the Prince of Demons?
This adventure brings players investigation the disappears of local craftsmen. If they fallow the clues it will lead them through the outland city of Rigus to the plane of Acheron. They will then find the Iron fortress and the warlord Imperagon. The adventure describes one of the cubes named Kolyoral. There are multiple agents at play on the cube as well as the imposing fortress.