The Dead Lands of Athas
A charnel house is a vault or building where human skeletal remains are stored. They are often built near churches for depositing bones that are unearthed while digging graves. The term can also be used more generally as a description of a place filled with death and destruction. Both are applicable to this location.
The necromancer Gretch directed this outpost to be built upon the site of the great Battle of Tforkatch River during the Cleansing Wars as a factory to reanimate corpses harvested from the battlefield, and later as a warehouse for corpses brought back from the siege of Nagarvos.
It remains today as a military facility for troops loyal to Gretch, and is operated by a Zhen known as Vizier Sthonkho.