Those That Dwell Beneath

Publisher's blurb: In ruins near the city of Thentia, grungs have been trying to build a portal where they could move slaves in secret from the city of Melvaunt. But something sinister took hold of them, trapping them in the darkness. A map of the ancient city, which once stood on the surface of the land, leads the adventurers deeper into the catacombs. But will they find glory and riches? Or horror and death? A 2-hour adventure for 1st-4th level characters.