From Halopedia, the Halo wiki
Captain Hestro • Commander Lochagos • Commander Malice • Endurance-of-Will • Hydra Soldier • Knight Bannerman • Knight Champion • Knight Dignitary • Knight Excavator • Knight Luminary • Knight Marshal • Knight Noble • Knight Strategos • Lord Viratus • Phaeton Helmsman •
This is a template that lists boss enemies in Halo 5: Guardians Warzone.