KING UNDER THE MOUNTAIN is the nomenclature used to refer to any files pertaining to the planet Onyx.[1] It was assigned on March 6, 2525 by Vice Admiral Margaret Parangosky. It was also the name of a file on Colonel James Ackerson's computer at CASTLE Base on Reach, containing files related to Onyx, and other material closely related to the Forerunners as well. The other file on Ackerson's computer was called S-III.[2]


The KING UNDER THE MOUNTAIN file contained:


  1. Halo: Ghosts of Onyx, page 127
  2. Halo: First Strike, page 129-130
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