Deep beneath the surface of Urngor lies the enigmatic region known as the Spina Sanguinis, a vast network of caverns and maze-like formations formed during the tumultuous Time of the Shattering. It was the disruptive surges of mana that swept over the land, creating massive subterranean chambers. Unexplored by the surface dwellers, these caves stretch for miles in every direction, with the central mass located beneath the northeastern region of the Sylwelsa Plains. Near major population centers such as the Cities Three and Baldor, natural and artificial vents open to the surface, serving as connections to the depths below.

In the year 2914 AS, the first of the Rictus descended into the depths of the Spina Sanguinis. Drawn by an unknown calling, the First Fallen, known as the Obsian Iter, initiated the construction of a kingdom that would become the source and homeland for the Rictus that would follow. Within these subterranean realms, the Rictus built the Sepulcher of Thorns, where their members would form in sarcophagi, their essences merging with the Thoughts from the nearby ethereal plane. Surrounding the Sepulcher is the Lighted Cloister, a grand hall adorned with polished marble, granite, onyx, and lapis, emanating hues of violet and cool blues that illuminate the space.

At the heart of this underground architecture stands the imposing Cerulean Basilica, serving as a place of meditation and learning for the Rictus individuals. The training grounds of the Cinis Zenith, led by the Proelium Domini, provide rigorous training to combat the corruption and monstrous aberrations that plague the world above. The unusual vault of the Liber Antiphonarum, overseen by the Memoria Umbra, preserves ancient knowledge and sacred texts, while the great Obscuratum Turrim serves as the seat of power for the Obsian Iter.

The cenobitic social structure of the Rictus facilitates their training against the lingering effects of the Time of the Shattering. Through their communal existence and shared rituals, they strive to resist corruption and darkness, safeguarding the world above from malevolent forces. The Spina Sanguinis serves as a mysterious and formidable realm, where the Rictus pursue their purpose and safeguard the secrets hidden within the depths of Urngor.