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Zereth Mortis is the forbidden realm of the First Ones, tucked away in the fabric of the Shadowlands itself. It was crafted by the First Ones to act as their workshop and is intended to create afterlives, a process carried out by the enormous Forge of Afterlives floating at the center of the realm. A race of mechanical caretakers called the Automa were left behind by the First Ones to facilitate this process. The realm's most notable feature is the Sepulcher of the First Ones, which contains knowledge that could rewrite reality. Zereth Mortis is a strange, alien location that defies all concepts of reality or physics. It is divided between a dry desert biome—perhaps showing what the realm looked like when the First Ones were establishing the space for themselves—and a lush forested one—a testbed for their experimentation on plant and animal life. The water in Zereth Mortis can be walked on, creating a threshold between it and another, even more primordial space below it. Aside from the automa, the realm is h
