From Halopedia, the Halo wiki
A network of Sangheili feudal raid lances were under the mercenary leadership of Ordo 'Mal up until his death during the Installation 07 conflict. When the raid lances served as a mercenary unit within the Banished, they were known as Kaepra's Grief.
After the Human-Covenant War, the legendary Wraith pilot known as Ordo 'Mal returned to his native keep where he would unite a network of feudal raid lances under his leadership. After the Sangheili civil war had started to wane, and he was approached directly by Atriox himself for service in the Banished. 'Mal accepted the offer, and he and his mercenary raid lances would join the Banished, with the raid lances becoming known as Kaepra's Grief.
Within the Banished, 'Mal's reputation would grow, especially after the Siege of Palghanar in which he personally killed hundreds of humans. His performance earned him favor with Escharum and the title of Wraithmaster. 'Mal and his lances would become some of most dangerous elements in the Banished combat stratagem. Kaepra's Grief participated in the Installation 07 conflict, during which time their leader, Ordo 'Mal, was killed by Spartan-II John-117.
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