From Halopedia, the Halo wiki
Brilliant Gift was a Covenant Spirit dropship. During the Battle of Installation 04, Brilliant Gift was captured by the Flood, and became a transport to spread its infection to the Fleet of Particular Justice orbiting over Alpha Halo.
The Brilliant Gift's mission before it was captured is unknown. After the Flood was released, they somehow managed to commandeer the ship and leave Installation 04 towards the Fleet of Particular Justice. The dropship headed towards the agricultural support ship Infinite Succor.
Despite the command crew's orders to the contrary, the dropship crash-landed into the Infinite Succor's hangar and was irreparably damaged, killing some of the Covenant crewmen stationed there. However, it ultimately did not matter: the Flood killed most of the witnesses and soon spread throughout the Infinite Succor, infecting the entire crew and the creatures in the hunting ground, except for the Minister of Etiology. One of the most notable combatants in the battle was Rtas 'Vadumee, Special Operations Commander and later Fleet Master.
The dropship was destroyed when the Infinite Succor was forced to make a slipspace jump into Soell, the system's star.
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