Darth-Nemo-Dak was an ancient book containing Sith knowledge and was part of a collection that belonged to Darth Wyyrlok, who held the title of Master of Sith Lore within the One Sith order. This collection was located within the order's Temple of the Sith, situated on Coruscant, which served as the capital of Darth Krayt's Galactic Empire.
The book's exterior featured a gray-brown color for its cover, with the title displayed on the spine using Aurebesh characters. Furthermore, some additional writing was also visible near the bottom of the spine.
In the year 137 ABY, Darth Wyyrlok was sifting through his collection in an attempt to discover a remedy for a terminal disease that afflicted his master, Darth Krayt. Darth-Nemo-Dak was among a stack of books in the vicinity during Wyyrlok's search.
Darth-Nemo-Dak made an appearance in a flashback scene within a comic panel of the twenty-seventh issue of Star Wars: Legacy, a comic series published by Dark Horse Comics. This issue was released on August 27, 2008, and was authored by John Ostrander, featuring artwork by Omar Francia and Brad Anderson.
Darth-Nemo-Dak is positioned towards the extreme right of a comic panel, resulting in a portion of the book's spine being obscured from view. To the right of the title, a partially unreadable fragment of text is visible, reading "discov–."