The laboratory of the Sith Lord Darth Sanguis was located in the labyrinthine system of meticulously carved tunnels deep below the Sith Citadel on the planet Exegol, a remote world steeped in the rich history of the Sith. It was home to a population of rat-grubs. The walls were emblazoned with the oldest of Sith runes, and the floor—covered in a thick layer of dust and detritus—had once been marked out in a symbolic set of interlocking circles.
Bottles and jars filled with unidentifiable tinctures cluttered obsidian work surfaces, and crumbling tomes, bound in cracked hide of some kind and covered in a thick smear of spiderwebs, sat on a crooked wooden shelf. A mirror sat at the edge of one of the obsidian workbenches. Another one had a disintegrated book that contained the designs that resembled structures on Malachor. Something that had once been flesh and blood, but had long before putrefied, sat suspended in a filthy tank of some unknown substance.
Deep below the Sith Citadel on the planet Exegol, the Sith Lord Darth Noctyss discovered Darth Sanguis' laboratory and notes on the ritual. After much study, she completed the three-day ritual, sacrificing Sanguis. The ritual then twisted her into a creature much like Sanguis had become, revealing to her that her servant, whom she suddenly understood had been Sanguis, had manipulated her to be freed of his immortal fate.