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.
The black clouds of war are gathering, and evil flocks to their thundering call! While seeking the legendary expertise of a cloud giant skymage, the PCs interrupt an attack on his lair by well-armed and magically augmented hill giants. To obtain the cloud giant's arcane knowledge, the PCs must seek out and eliminate the source of the hill giant threat, yet the brutes have little information other than the name of their employer—a mysterious giant calling herself the Storm Queen, whose anger and hatred have transformed over the course of years into a murderous plan that could cost hundreds of innocent lives.