Singularity is against the Great Work
The closest "nest" of Onilleth to the City of the Valsharess is relatively recent but growing quickly. The Elder Mind remains One with all its children and thralls, seeking to explore and expand its territory. Unbeknownst to its greatest enemies, this nest has clashed with both cities of the Dark Elves. It has studied them thoroughly, intently, wishing to Understand only enough to determine whether this obstacles should become part of the Great Work, or simply be eradicated.
There is a very long cycle of awareness for what appears to be the only Dragon living in the Deep Tomb. While he Sleeps, the races manage their own affairs and after enough births and deaths, many can forget about him or believe past tales once spoken by individuals who claimed to have met him must have been partly insane.
When he Awakens, however, the Oldest Stories swiftly resurface and remind all living beneath the Surface they are not alone.
A scholarly prison for all Davrin males of significant magical ability.
The Tower is located roughly halfway between the Cloister and the Palace/Sanctuary. It is constructed within a gigantic natural formation of a stalagmite and stalactite meeting and fusing together, refined and reinforced with magic.
There are many levels within the Tower, including libraries, dormitories, and practical work space. They are reachable only by magical transport circles; there are no stairs. Non-magical Davrin would have difficulty entering any level without escort or invitation.
The Tower is run and defended by Headmaster Phaelous, both the oldest and most favored male wizard in Sivaraus. He guards and teaches all the other younger buas.
The Barracks of the Red Sisters, the queen's enforcers.
Located outside the City center and away from any one Noble House, this is the base of operations, training and initiation center, and the living quarters for the Sisterhood. It includes a stable of riding lizards.
The Cloister is built down into the cavern layer and is not visible to those traveling through the Davrin territory. Wards and spells keep all others from trying to claim it or build on top of it; this part of the cavern is universally ignored.
The Cloister also contains interrogation rooms and a rarely-used "solitary" cells; any prisoner to show up there has vanished from the public eye, usually for a specific reason, and are never seen again.
The home and office of the Priestesses of Braqth, the Spider Queen.
Many secret meeting rooms, spying networks, and ritual altars both private and open to the public for ceremonies.
The Consorts are raised and trained within the Sanctuary and do not leave unless they are gifted to a Noble House by the Valsharess and Priestesses in a "worship ball," about once every ten to twenty years.
Alongside the "virgin" Consorts are raised various Davrin children who are claimed by either the Valsharess or Priestesses for one reason or another. Any offspring of the Red Sisters would be among them.
The Sanctuary also contains (and imprisons) the half-demon Sathoet, all first and only sons of the Priestesses.
Home of the Valsharess.
Location of the Court games, primarily Nobles visiting, long or short, from their Houses on a mission to garner favor and make deals. Also the location of the worship ball and other public functions, by invitation and arrangement of the Valsharess and her retaining staff.
There exist also separate meetings rooms, lavish and secure quarters given to favored Davrin, and at least two audience chambers for the queen to see and be seen, depending on the size of the audience.
The Palace connects with the Sanctuary, and the dungeon below contains most of the queen's prisoners.
~Because there is only one City of Dark Elves, didn't you know?
Located in an enormous cavern deep below the Surface, Sivaraus is the Valsharess seat of power ruled by the queen, Her Priestesses of the Spider Queen, and Her Red Sisterhood.
There are currently twenty-four Noble Houses with ranking and status, who run "plantations" farther out from the center, each involved with resource production and trade with select other races of the Deepearth. The central part of the City contains mostly the "common" merchant and artisan classes who act as the "middle-women" between the Noble Matrons and the other races, with the Palace and the Sanctuary looming above them, but it slides into a black market slum quickly enough.
Slave labor is common and necessary for what has been built, and even though there are many situations in which the "service" of a male Davrin or a non-Noble female Davrin (if young, called a cait) may as well be slavery, all Davrin are considered "free" citizens, while the non-Davrin are slaves without question. A common male Davrin (often called a bua) would have some standing over a captured gnome, though he may endure more varied demands of his body than any true slave.