Sun in Shadow

 Sun in Shadow refers to the extensive subterranean city beneath Twin Elms, where the gods of Eora were created by Thaos' civilization. It is the final location visited in Pillars of Eternity.

Background
Sun in Shadow was the capital of the Engwithan civilization and its greatest city. Located beneath what is known to the kith as Twin Elms, it was a jewel of architecture and its greatest city. However, the creation of the gods destroyed it, taking the souls of thousands of men, women, and children, striking them down where they stood and feeding into the great machine erected at the heart of the city. The ashen husks and crumbling skeletons of dead Engwithans still lay where death took them, forgotten by history. This particular area was the center of the Engwithan civilization and its greatest court, with a machine that created the gods.

The Court itself is a circular room, grand and domed, its walls lined with adra and trimmed with copper. At the far end a great pillar of adra pierces the floor from below, its shimmering texture giving the illusion of boundless depth. Encircling the pillar is an apparatus, a machine that Thaos slyly describes as bringing structure to the chaos that surrounds it.

Points of interest

 * This is a long, linear path to the final confrontation. You enter into a vast, dark chamber, with a path leading to the right, onto the Walk of Souls. Husks of ancient Engwithans line the walkways, falling apart as you loot them. Once you approach the first walkway platform, the souls you received from the gods will illuminate the city, revealing its grand buildings and lighting the way to its heart, where the machine that birthed the gods resides.
 * The next step is the Guardians' Dome to the northwest, where the chalky skeletons of two drakes once chained and standing guard over the city remain. Activating the dome will prompt an attack by Engwithan shadows and a drake. Continuing down the path will lead to an encounter with Wael, the god of mysteries, who will offer you another option: Rather than follow the whims of the other gods, follow his and scatter the souls across Eora at random.
 * You can jump over to the freestanding segment of the bridge to gain minor loot from the corpse.
 * The next stop is at the top of the stairs and by the entrance into the Court where Thaos awaits. The rest of the map contains nothing of importance.
 * The Court
 * Make your way down the steps, past the husks of Engwithans forever contorted in anguish by the machine at the heart of the court, the birthplace of the gods. The quest will complete once you reach the platform, with Thaos awaiting at the base of the machine.