High Quality Content by WIKIPEDIA articles! Ghosts of Onyx is a novel by Eric Nylund, set in the universe of the Halo video game series and released on October 31, 2006. Ghosts of Onyx was the fourth Halo novel published, and Nylund`s third contribution to the series. Onyx was also the first of three Halo novels to be published by Tor Books, rather than the previous publisher, Del Rey.