"Stop the train from reaching its destination."


  • Find the Arusha Monorail.
  • Fight your way to the Monorail, board the train.
  • Fight your way to the front of the train before it reaches its destination!
  • Defeat Boagrius.


  • Boss: Brute Chieftain Ultra Boagrius
  • Flood Infection Form
  • Flood Carrier Form
    • Flood Carrier Form: Elite
    • Flood Carrier Form: Brute
  • Flood Combat Form
    • Flood Combat Form: Human
      • UNSC Marine
      • UNSC ODST
    • Flood Combat Form: Elite
      • Elite Minor
      • Elite Major
      • Elite Ultra
      • Shielded Elite Major
      • Shielded Elite Ultra
    • Flood Combat Form: Brute
      • No Power Armor
      • Power Armor (Captain)
      • Power Armor (Chieftain)


  • UNSC
    • Assault Rifle
    • Magnum
    • Battle Rifle
    • SMG
    • Shotgun
    • Rocket Launcher
  • Covenant
    • Spiker
    • Plasma Pistol
    • Carbine
    • Plasma Rifle
    • Needler
    • Fuel Rod Gun
    • Mauler

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