Ardo 'Moretumee was an Elite General who served as the Shipmaster of the SDV-class heavy corvette Ardent Prayer in the Fleet of Valiant Prudence during the Fall of Reach within 2552 a year during the Human-Covenant war.
On the night of July 23, 2552, the Fleet of Valiant Preduce including the Ardent Prayer was deployed as an advanced force to the human homeworld: Reach. Over the following weeks, the CSO-class supercarrier Long Night of Solace, revealed its location during the Fall of Reach which caused SPARTAN Catherine-B320 formulated Operation: UPPER CUT, a plan to destroy Long Night of Solace through the use of an improvised "slipspace bomb".
On August 14, SPARTAN-B312 and several YSS-1000 Sabre pilots, with the assistance of the UNSC Savannah, boarded Ardent Prayer; the UNSC intended to use the Ardent Prayer to deliever the improvised bomb to the Long Night of Solace, while the former was en route to refuel with the supercarrier.
As the boarders made their way through the corvette, they assaulted the bridge. The bridge crew were unaware of UNSC forces boarding their ship but Ardo and his crew defended themselves, but were killed by the boarders. Ardent Prayer continued towards Long Night of Solace and the bomb was activated which destroyed both vessels.