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Containment Breached | Endless Halo 2 AI War

“During the battle of Installation 05, the Covenant dispatched a military unit with an intent of drawing the Flood away from the Arbiter and Tartarus as they retrieved the index. The Flood are hell bent on consuming these Covenant invaders. Choose your alliance and join your fellow troops in battle!”

*Mod updated to be compatible and functional with the Halo MCC patch released on February 28th, 2025.*

I developed this mod to emulate the combat design of the campaign level Quarantine Zone. This was a mission that always fascinated me, and I always wanted the large scale Covenant vs. Flood sections to last longer. This map also draws some inspiration from a mod made back in the H2 Xbox days. It was called “AI War”, and was one of the maps included in the AI Revision Mod Pack back in June 2007. Originally, the mod featured UNSC vs Covenant forces, and included AI vehicles as well. I decided to re-do some things with my own ideas, and made the level Covenant vs. Flood. If you have played the original - I think you will love my version!

• An endless AI war that lasts as long as your session goes.
  
• Pathfinding everywhere.
  
• *NEW* Spectator tools accessible with the Acrophobia skull. Perfect for players that like to sit back and watch the AI do battle.
  
• Placed respawning weapons and powerups at each of the bases.
  
• Placed empty vehicles at each base that respawn.
  
• Faction appropriate scenery at each base.
  
• Custom code that rewards players checkpoints occasionally, so death doesn’t reset you back to the beginning.
  
• Many types of AI that spawn for each side at assorted intervals with lots of variations and classes, all chosen at random so no two fights are the same.
  
• AI controlled vehicles that are spawned for each side. They are endlessly respawned just like all ground forces.
  
• Careful control over the total AI on map so the game engine is not overloaded.
  
• Play as an Elite General on the Covenant side, and an infected Spartan on the Flood side.

And more! You will have a blast on this one!



After subscribing to this project and letting the download complete, launch the MCC with anti-cheat disabled. Navigate to campaign, then Halo 2: Anniversary, and in that menu there should be an option that has appeared called "Containment Breached | Endless AI War". Click on that option, and in the next menu select “missions”. There are two missions included in the mod. Both are identical maps, with the only difference being the side you are allied with, and the character you play as. To play as the Covenant, select the “Covenant” option. To play as the Flood against the Covenant forces, choose the “Flood” option. The experience is highly customizable with players being able to choose the game difficulty, as well as which Skulls are active for the session. All of the Skulls are fully functional, just like in the campaign. After selecting your options, launch the level and have a blast!



I have received requests in the past from players that wanted the mod to be more spectator friendly. I have implemented a switch that you can toggle that sets all AI to be friendly to the player, but not the opposing faction. Now you can watch the fight without any worry of being singled out and fired upon. Please see the guide thread to learn how to use these functions.


- Halo CE Assault Rifle by VKMT. Find it here: https://www.nexusmods.com/halothemasterchiefcollection/mods/1561
- Infected ODST by Blackandfan. Find them here: https://www.nexusmods.com/halothemasterchiefcollection/mods/2157
- Infected Brute by Blackandfan. Find them here: https://www.nexusmods.com/halothemasterchiefcollection/mods/2182
- H3 Mauler by Ryno. Find it here: https://www.nexusmods.com/halothemasterchiefcollection/mods/2339
- H2 Mongoose restored by the Digsite Crew.