Hand of Atriox
From Halopedia, the Halo wiki
The Hand of Atriox was a special operations unit within the Banished, named in the honor of its presumed late leader Atriox. Also known as Spartan Killers, these warriors specialized in taking down UNSC Spartans. Jega 'Rdomnai was its first recruit and served as one of its most feared members.
As of 2560, there are three known members of the Hand of Atriox.
List of appearances