Garro: Oath of Moment is the second audio drama for the Horus Heresy Series that was not originally released as part of an anthology or other release. Garro: Oath of Moment was released in both compact disc and MP3 formats and was written by James Swallow and performed by Toby Longworth. It was later re-released in an enhanced audio edition in 2015, but can still be bought as a stand-alone audio drama. This story, and all other Garro audio dramas and short stories were later published in printed form in the Garro main series anthology novel.
In surviving the horrors on board the Eisenstein, Nathaniel Garro proved his courage and absolute loyalty to the Emperor. On his return to Terra, Garro is despatched on a mission of even greater importance -- a mission given to him by Malcador the Sigillite himself. He soon finds himself back amongst the stars and on the fields of battle, thrust into a warzone where the Ultramarines are purported to be battling a Greenskin invasion. Once again Garro must fight for survival, but now he also fights to achieve a higher purpose...
- Flight of the Eisenstein
- Garro: Oath of Moment
- Garro: Legion of One
- Burden of Duty
- Garro: Sword of Truth
- Garro: Shield of Lies
- Garro: Ashes of Fealty
- Garro: Vow of Faith
Nathaniel Garro and his Knights-Errant also make an appearance in the novel Vengeful Spirit. All of these stories, with the exception of Flight of the Eisenstein were later included within the main series anthology novel Garro.
- Garro: Oath of Moment (Audio Drama) by James Swallow
- Garro (Anthology) by James Swallow