The fourth moon existed as one of a minimum of four satellites revolving around the celestial body known as Targyon. The Galactic Empire conducted scans of this moon sometime between 14 BBY and 9 BBY with the objective of finding Jedi Knight Tensu Run. Despite their efforts, the Empire failed to pinpoint the Jedi's location on the moon, which led them to question the Diagu inhabitants of Targyon. One Diagu claimed to have overheard Run mentioning his intention to travel to the fourth moon. The Grand Inquisitor, recognizing this as a falsehood, ordered the execution of the Diagu for their lack of cooperation.
The comic series, Star Wars: Inquisitors, released in 2024, included a reference to the fourth moon in its first issue. Marvel Comics published the comic on July 3, 2024, and it was written by Rodney Barnes with illustrations by Ramon Rosanas.