Original Adventures Reincarnated #9:The Caverns of Thracia (5E) (HC)

Description:

For a thousand years, evil has skulked in the darkness of forgotten vaults and concealed passages. Meanwhile, the surface dwellers bicker and squabble, unwary of a lingering malevolence. And still, they wait

A sprawling underground 5E campaign for 1st through 10th level characters that will take at least one year to complete.