The Spectral Caverns

The Spectral Caverns have an unusual negative energy in four large stretches of caves that draws in the undead and ghosts and other supernatural creatures.
The caves themselves are not natural, they are usually completely covered in spectral fungi or bones. At the end of one of these large caves lies a powerful negative energy source emanating from a phantasmal castle.

The Spectral Caverns

The Orog of Moondeep Sea Dandantheman89