Kal'Shabbol was a planet in Ashlan Expanse, part of the Unknown Regions. Saint Michael, a prophet who foresaw the establishment of the Order of the Whills and the writing of the Journal of the Whills, was from Kal'Shabbol.
The planet was also the home of Ussej Padric Bac, Laili Jeyna Rendar, and their son in the years following the Great Territorial War. Ussej found his own personal salvation on Kal'Shabbol, which he came to think of as his true home; Kal'Shabbol was also the location of the Bendu Order, which Ussej became part of after the Great Territorial War. Bac had many fond memories of Kal'Shabbol in the thousands of years after his mortal life ended there and he became the Shaman of the Whills.