Ossus

Ossus was the third planet in the Adega system in the Auril sector. Originally a rich, lush world, Ossus was ravaged into an arid and toxic planet with the destruction of the Cron Cluster. Life returned to Ossus, however, and the planet was eventually restored by Yuuzhan Vong terraformers through the Ossus Project.

Ossus was an important Jedi site for over twenty-five millennia, serving as a repository of knowledge and a center for learning for the Old and New Jedi Orders alike. In the latter years of the Old Republic and beyond, it was home to the tribal Ysanna, descendants of Jedi who had survived the Cron supernova. The planet came under attack by the Sith twice, once in 3,996 BBY and once in 130 ABY, and was invaded by the forces of the Galactic Alliance Guard in 40 ABY.