Seal the Void Gate
Mission #3 from Shadows of Brimstone (Basic Missions)
on page 22
A stable Void Gate has opened deep in a nearby mine and all manner of horrific monstrosities are pouring out! Finding a way to seal the gate within an ancient occult tome, the local Holy Man lead a group down into the mine a few days ago to try to put a stop to the rampage. They have not been heard from since, and the waves of creatures are getting stronger and more frequent. Something must be done, or this entire area will be overrun in a matter of days!
Locations: Mine