The Corruption of Cavestar

The Corruption of Cavestar is an adventure module for the Dungeons and Dragon game, fifth edition. The adventure is intended to challenge an adventure party of level 5. Its modular design allows you to place the cavernous city of Cavestar anywhere in a larger campaign.

The Bulette, the main antagonist

The party will explore Cavestar town and the mines beneath it to uncover what happened to the deep gnome inhabitants. As they delve deeper they will gain experience and treasure until at level 7 they are ready to challenge the terrifying cause of the corruption, a mighty Bulette under the sway of a cursed item.
The corruption has done many terrible things in the town. Those under the sway of the Bulette scour the streets to find sacrifices to the beast, in a mistaken belief that their sacrifices will keep it at bay. No creature can be trusted, except for maybe that few uncorrupted gnomes that remain.

Town map of Cavestar
The town of Cavestar