The moon was colonized by the Trandoshans. During the Clone Wars, it was the site of a Trandoshan hunting party that captured sentients from various parts of the galaxy and brought them onto the moon to use as prey. Jedi Padawan Ahsoka Tano was captured by the hunters and brought to Wasskah. Tano attempted to save several other Padawans who had also been captured and stranded there. The surviving Padawans banded together with the captured Wookiee Chewbacca and managed to contact his friend, General Tarfful, who arrived with a rescue team. The Trandoshan gang was wiped out in the skirmish.
- Star Wars: The Clone Wars – "Padawan Lost" (First appearance)
- Star Wars: The Clone Wars – "Wookiee Hunt"
- Star Wars: Clone Wars Adventures (video game) (Mentioned only)
- "Launch Pad"—Star Wars Insider 124 (First mentioned) (Misspelled as "Iwasskah")
- (First identified as Wasskah)
- Star Wars: The Clone Wars: Incredible Vehicles
- Star Wars: The Clone Wars The Complete Season Three
- Star Wars: The Ultimate Visual Guide: Updated and Expanded
- "Behind and Beyond the Battle Lines"—Star Wars Insider 134
- Star Wars: Edge of the Empire Core Rulebook
- The Bounty Hunter Code: From the Files of Boba Fett