From publisher blurb:
In the deepest reaches of the dwarven kingdom, Ghin Faradum, there lies an ancient, cyclopean construction built by the extinct goblin civilization of yore. This pyramid-shaped edifice is dedicated to warding off an evil entity known as the Poisonous Deity. The goblins learned that this extraplanar being required a flesh tribute to inhabit in the Material Plane. Without it, the Poisonous Deity grows restless and dangerous. 3 years ago, a human expedition visited the place and was never heard of again. The lead explorer was taken over by the evil entity, the man is still there, having his lifespan enhanced by the Poisonous Deity.
Today, the explorer's grandson hires the characters to escort him to the Forlorn Ziggurat. The young scholar wants to learn what happened to his grandfather and, if possible, continue research in his line of work. In the strange ziggurat, arcane powers beyond the comprehension of mortals are at play. The heroes require every ounce of courage to emerge alive from this quest.