From Halopedia, the Halo wiki
After the Human-Covenant War, Zef saw the benefit of human capitalism and turned mercenary. At some point, he met the journalist Petra Janecek and became one of her most adept informants; being able to ascertain Thomas Lasky's identity and background before the latter took no more than three steps off Janecek's ship.
In March 2558, Zef met Petra, Captain Thomas Lasky, and Spartan Naiya Ray at a bar in Kor Delban. He gave them important information about Vata 'Gajat, as well as the identity of Daniel Clayton, the UNSC traitor who had compromised the location of the Sangheili-Jiralhanae peace talks.
Zef wears a black Ascetic harness.
List of appearances