Xerxian, a Moff in the reconstituted Sith Empire, was either Human or of Sith pureblood heritage. Sometime following the Great Galactic War's capture of the planet Sullust by the Empire from the Galactic Republic, Xerxian was appointed its governor. However, his inability to suppress a violent uprising by the native Sullustans between 3681 and 3640 BBY resulted in him being called to a one-on-one meeting with Darth Marr, who sat on the Empire's governing Dark Council.
Following his encounter with the Sith Lord, Xerxian penned a resignation letter and then committed suicide by gunshot, leading many to speculate that Marr had revealed his disfigured face, causing Xerxian to lose his sanity.
The character of Xerxian appeared in Star Wars: The Old Republic Encyclopedia, a reference book that was released in 2012.