Far in the south of Karkoz are the Abyssmal Mountains. The mountains are a result of the fissures created during the Boom War. The mountains are composed of dark stone and are riddled with fiery lakes and rivers of lava. The mountains are said to contain various portals to the Abyssmalsphere. Large numbers of demons in the area provide evidence of said portals.
In Blaine McDaine’s Guide to Far Away Land, the author gives the Abyssmal Mountains a 0 out of 10 rating. He writes, “This place is a living nightmare. Several of my companions were eaten yesterday by something with three heads. It smelled like garlic. I managed to escape only by outrunning everyone else.”