Zareb belonged to the Intendant caste among the Yuuzhan Vong. Once the Yuuzhan Vong had conquered and Vongformed the planet of Coruscant, transforming it into Yuuzhan'tar, Zareb received the position of Prefect for Numesh. To orchestrate Zareb's downfall, Nom Anor, disguised as Yu'shaa, arranged for Shamed Ones propagating the Jeedai heresy to infiltrate Zareb's household, and subsequently had the Priestess Ngaaluh expose their presence. The proof implicating Zareb appeared overwhelming—even to Supreme Overlord Shimrra. After personally investigating, Shimrra found that Ngaaluh was actually responsible for planting the Shamed Ones within the homes of multiple Prefects. Despite this revelation, Shimrra proceeded with Zareb's execution, choosing to maintain the ongoing eradication of heretics.