Considered a launch point for the Blood War armies departing from the Abyss, the Courts of Mustering is a layer of an endless series of "tastefully" appointed courtyards and gardens, many of which are equipped with a planar portal which lead to one of the other Lower Planes.
The one single elevated structure in the layer is the gem-studded tower of the balor Gurtheonir, an archdemon (an advanced Balor with levels in fighter or blackguard). Gurtheonir watches, directs, and "musters" demonic armies in the courts and through the planar portals. However, many of the portals are also one-way trips, thus often making incursions originating from the layer suicide missions, but at the same time preventing the layer from being invaded.

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