The Southern Library is a name that refers to the in-between plane of the Sphinxes but it is also the name of the initial structure built in this plane. A multi-tiered pyramid, this structure was massive, created to be used by the Sphinxes in their normal forms. An entrance at the top provided stairways into the various levels of the pyramid, creating places to not only store their research, but also a variety of rooms that could be used for normal activities and housing.