Duat Caves

Origin
The Duat is the realm of the dead, the underworld, in ancient Egyptian culture. Through it, the god Ra would allegedly sail every night and battle the Chaos Serpent Apophis.

Agent Taylor has theorized that it is a pocket dimension crafted by a person later deified as the protogenoi Nun, who allegedly embodies the vastness of Space itself and is comparable to the Hellenistic entity Khaos.

Features
Duat’s primary features include the River of Night, along which Ra would sail.
 * Watercourse of the Only God: It is here that souls of the departed would be judged by the Scales of Ma’at. Also here is the sarcophagus of the one deified as Osiris.
 * Hidden: The site of the battle against the Eternal Serpent Apophis, with the assistance of another such Serpent named Mehen, who still resides there to this day.
 * Sarcophagus of the Gods: In the myths, dead gods would call to Ra from here. In reality, most of the pantheon, after their passing (notable exceptions including the aforementioned Osiris, Imhotep, and Ra).
 * The mountains Baku and Manu serve as the anchoring points for the pocket.