The Abscess is a massive dome that contains the dormant body of Atar.
The Abscess is a huge, dome-like structure miraculously built from mud. It is only accessible via a ritual safeguarded by the Bahutha's Great Abesses. Any who do not perform the appropriate ritual will be greeted by nothing but an altar of stone and unconquerable terror. The Abscess is located somewhere in the desert of An Nafud.
The Abscess's ritual is only possible for those born with Atar's blood. It is also located somewhere in between the physical and demonic planes, indicating that Atar's original children (and by extent, the founders of the Bahutha) were dimension-hopping fairies.