This is no Cave

Mission #1 from The Burrower

"When a new mine, rich in Dark Stone appeared up in the hills, all the local prospectors were overjoyed. No one bothered to ask where it came from. Damn greedy fools! But it soon became clear... anyone that went into that mine never came back out. Then the earthquakes started. I'm tellin' ya, that's no cave. There's somethin' inside that mountain and it's eating the world from the inside out!"

Locations: Mine