From publisher blurb:
A 5th Edition Mini-Dungeon adventure for 4-6 characters of level 7
No mortal remembers whether Gholaad was a deity, a primordial titan, or something else, but it is said the being was slain with a dagger made of pure void, which erased Gholaad and disappeared as it struck home. A primordial sludge suffused the being, transforming it into a winding cavern. Today, perfectly smooth walls and floors are reminders of this unnatural origin; only the living dead and the desperate seek the emptiness that was Gholaad, hoping to be translated from their current state into another.