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Floodhalla - A Halo 3 AI War

“During the Battle of The Ark, the Gravemind teleports and crash lands the remnants of High Charity on the installation in an attempt to stop the Prophet of Truth from activating the rings. A large chunk of the station containing Flood has landed near a familiar, curious gorge. UNSC and Elite forces stationed at the waterfront tower are quickly attacked by the parasitic horde. You must hold out as long as possible against the Flood.”

*This mod has been updated to be compatible with the MCC patch released on September 17th, 2025.*

My next AI War project is now complete. Valhalla has been transformed into a Flood outbreak apocalypse, with new visuals and flood themed background audio for an extra immersive feel. This mod is simpler then my other projects, with this being a more infantry focused fight instead of an all out war with vehicles. As with my other projects, the battle will go on forever, with all forces being replenished shortly after being eliminated. Conventional military units will back up the survivors at first. After they are lost, special operations teams will be flown in to assist. Choose to hold off the infected horde, or join the flood and help spread the parasite. The nearby Forerunner structure has detected the intruders, and is sending in Sentinel flights to help neutralize the threat. They will attack anyone in the valley - so keep your eyes to the sky if possible.

Welcome to Floodhalla.

• An endless AI war that will go on for as long as the game lasts.
  
• Major visual and audio changes to Valhalla's environment/ecosystem.
  
• *NEW* Spawn Controllers for each and every AI squad that appears on map. You are the boss and are fully in control over the battle.
  
• *NEW* A vastly expanded Forge palette. Every Weapon, Vehicle, and most scenery objects from the DLC map "Sandbox" included on this map.
  
• Special forces delivered by dropships for the survivors once the starting squads are eliminated.
  
• Assorted Flood forms and equipped weapons, so each fight is different every time. Carriers, Pure forms, and Combat forms all included.
  
• UNSC special forces of ODST's with random weapons.
  
• Elite forces with assorted, randomly chosen ranks and gear. Accompanied by special operations Grunts that also come with randomly picked gear.
  
• Pathfinding everywhere.
  
• Custom H2A themed Elites. See credits section below!
  
• Increased Forge budget to $15000.
  
• Sentinels that will fly into the valley and attack anyone they come across.
  
• All AI squads (except the initial waterfront personnel) are infinitely respawned once killed.

*CO-OP is NOT supported on this mod. Only the host player will see AI behaving properly. All clients will have visual anomalies and desync for the AI combatants.



Subscribe to the mod on Steam. Once the download is complete, launch your game with Anti Cheat disabled. Head into Forge or Custom games, select Halo 3, and then choose modded maps. Find Floodhalla, and then load in as usual. You are now all set.

• Halo 2A Elites by Ryno. Find them here: https://www.nexusmods.com/halothemasterchiefcollection/mods/2030
  
  
• Sentinel Captain and Eliminator Beam by Just Alex. Find them here: https://www.nexusmods.com/halothemasterchiefcollection/mods/1624

• UNSC/Elites - GREEN
  
• Flood - PURPLE
  
• Sentinels - GOLD

On all other teams, the player will be alone with no ally AI.


With update 1.2 of this mod, team spawns have been made to be more consistent across the board. Due to Halo 3 multiplayer limitations, this takes some effort from you the player to set up each game. Following this process is not required if you do not care about where players will respawn. If you do want your spawns to work correctly, follow this procedure each time you start a new game on this map.

Make sure you are on the RED team when in the pregame lobby. After configuring your settings, launch the match. Make sure you are still on the RED team on the first spawn in. From here, you are going to be joining a few teams in a very specific order. This matters. Please follow this order exactly:

Change from RED to BLUE > GREEN > ORANGE > PURPLE > GOLD.

After you make it to GOLD, you are all set. Join the teams listed above in the AI teams section to ally yourself with a faction. Spawns will be consistent with the sides the AI arrive on. Green will spawn you in the UNSC side, Purple will spawn you on the Flood side, and Gold will spawn you in the map's center near the Sentinel spawn. Being on any other team color other than GREEN, PURPLE, or GOLD will result in you being alone with no AI allies. If you fail the above order of team swaps, you will need to return to the pregame lobby, reset yourself to RED team, and start again in a fresh session.

• When looking directly down in certain locations of the map, lighting bugs may appear.