The Sunken Cemetery

From publisher blurb:

Two weeks ago, as workers were digging a new section for the sewer, they broke a wall that led them to a big underground cave. The floor of this cave was filled with graves, which made the officials believe they found something of archaeological value, perhaps remnants of the old Cor'Duer or a civilization which lived here before the city even existed.

As the workers were exploring these graves, they awoke something ancient. Skeletal barbarians, shamans and wizards rose from their rest and attacked, killing all but one worker who escaped to tell the tale. What's even worse, some of these monsters have been reported to have made their way to the surface, terrorizing locals before the city watch could intervene.