Nerrethel

Nerrethel was a Sith Lord of the reconstituted Sith Empire. Sometime between 3645 BBY and 3642 BBY, Nerrethel grew interested in the structure known as the Dark Heart on the planet Voss, and spent two years studying the structure, comparing its architecture to that of the ancient Sith of the planet Korriban and analyzing the Dark Heart's orientation relative to Voss's constellations. However, when he attempted to visit the Dark Heart in person, Nerrethel was found dead on the border of the surrounding region known as the Nightmare Lands. His only notes from the expedition were the words "It sees"—for he had encountered the entity Sel-Makor within the Dark Heart.

Nerrethel was mentioned in the Codex entry for the Dark Heart in Star Wars: The Old Republic, a video game released by BioWare in 2011.