Byss and the Deep Core
"Byss and the Deep Core" is a digital enhancement for the Star Wars Roleplaying Game, brought to you by Wizards of the Coast as part of their Planet Hoppers collection of articles. Rodney Thompson penned this work (acknowledging Daniel Wallace for his assistance), and it saw release in April of 2005.
Website description
Located deep within the Deep Core region, the enigmatic world of Byss serves as a key location within the Imperial territories. This world, once a thriving and bountiful paradise, served as Emperor Palpatine's private sanctuary and a tempting destination for those drawn to settle in the Core. As time passed, the Emperor's potent dark side influence gradually tainted Byss, ultimately transforming it into one of the galaxy's most formidable centers of dark side power...