Diurna, a vast underground city on the planet Aubadas, served as the home of the Katikoot species. Constructed from soapstone, its architecture was characterized by numerous towers and arches, and inhabitants primarily used hoversleds for getting around. The Life-giving moss native to the planet played a significant role in sustaining the city. Diurna resided within a large cavern, its walls adorned with glowing waterfalls that flowed into a moat resembling a river surrounding the city, which was filled with plankton, illuminating the entire cavern.
In 382 BBY, the city, then under the leadership of Minister of works Kittik, reached out to the Jedi Order and the Galactic Republic seeking assistance due to a looming energy shortage. The Republic Pathfinder team known as Outer Rim Expedition Two-Five-Two was the first to respond. They then traveled to Gloam, Aubadas's sister planet, to locate a fuel source for Diurna. Following the disappearance of that team, Jedi Master Silandra Sho's pathfinder team journeyed to the city in an effort to find the missing team Two-Five-Two.