Garro: Sword of Truth is the eighth audio drama for the Horus Heresy Series that was not originally released as part of an anthology or other release. Garro: Sword of Truth was released as an MP3 format download in November 2012 and was written by James Swallow. It was later re-released as an audio CD in December 2012, but can still be bought as a stand-alone audio drama MP3. The story was also published as part of the Garro main series anthology novel.