Brilliant Gift
From Halopedia, the Halo wiki
The Brilliant Gift is a Covenant Spirit dropship seen crashed in the swamps in 343 Guilty Spark, it doesn't pose a threat when you see it and won't attack you, though the Covenant survivors will. The Flood some how managed to retrieve the ship and put it back in working condition in order to board the Infinite Succor and escape the ring.
It is to be noted that the Flood were infected Human Combat forms armed with human weapons and NOT Covenant. They were possibly members of Captain Keyes' team when they first encountered the Flood.
Despite the command crew's orders to the contrary, the dropship crash landed into the Infinite Succor's hanger and was irreparably damaged, killing some of the Covenant crewmen stationed there. However, it ultimatley did not matter since 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 Legate. One of the most notable combatants in the battle was Rtas 'Vadum, Spec Ops Commander and later Shipmaster.
The Brilliant Gift was presumed lost when the Infinite Succor was destroyed.
