Underkaskala (also known as Hell's Father) is the capital city of the Felkarr. It is located below an unnamed island of the same name off the coast of southwestern Northrend. The only part visable on the surface is a fortress known as Castle Eisodos. Inside, it looks like a cross between the Undercity and Kaskala. The walls are lined with demonic tuskarr statues and David Blaine posters. It is a very evil place.