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Ke 'Nzahz appears in round 3 of Warzone Firefight on Attack on Sanctum at the Temple location. Killing him earns the player a Legendary Takedown achivement. However, the round will not end until the 4 spec-ops elites that also spawn are killed. Although he is only a Legendary Boss, he uses the Mythic Elite model. This is the same for other Elites, such as Primes, when they appear in the final round.
List of appearances