From publisher blurb:
For a level 8 party!
A duergar mining expedition has led to a curious find - the entrance to the mythical Forge of Creation, where the first dwarves supposedly created the tools that brought civilization to the world. Their discovery has not gone unnoticed though, as their toiling within the forge has activated a portal to the Elemental Plane of Fire, drawing the attention of the efreeti Camus, Eyes of Midnight.
The PCs are caught in a clash between the efreeti sultan and the meddlesome duergar, and must survive threats from each faction and the dangers that lurk within the forge itself!