From Halopedia, the Halo wiki
In Decmber of 2553, a Banished flotilla was holding in orbit above Nereus X and using it as a temporary hideout. Rear Admiral Serin Osman had a prowler in the Nereus system observing the ships and was considering giving the order to launch an operation against them on December 8, pending the determination of an investigation concerning the murder of Graselyn Tuwa and the potential kidnapping of her family.
List of appearances
- Halo: Retribution (First mentioned)
- Halo: Retribution, Chapter 2