The Record of Rassilon
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The Record of Rassilon was a book that contained interpretations of Rassilon, Omega and the Other. (PROSE: Lungbarrow) At some point, an extract came into the possession of Sarah Jane Smith and K9 Mark III. (PROSE: Still Need a Title!)
It detailed Rassilon's involvement in the Eternal War. (PROSE: The Record of Rassilon, Still Need a Title!)