The PCs follow the trail of some particularly competent kobold thieves to the lair of a dragon cult deep in the swamp. There they discover efforts underway to grant sentience to the skeleton of a powerful red dragon once named Flame. Eventually the PCs determine that trouble has returned to the Western Mountains in the form of a band of fire giants ruled by a clone of the original red dragon named Flame.
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.