Halo 3 Seraphicy's AI Mod Sandbox Expansion (FIXED DOWNLOAD) addon

The base mod is by Seraphicy and I take no credit for the effort and work put into that mod. Go check his mod out!

***ONLY WORKS WITH ONE PLAYER***

***To board Truth's Gravity Throne (he can also die from damage) you'll have to use a SPARTAN character***

Basically what this mod does is give the player a premade Multiplayer map on Sandbox, with custom AI Encounters, AI Behaviors, scripts, shaders, and a boss fight. The AI have been retweaked to be more aggressive, including Brutes and Elites, the latter of which dual wield in combat too.
Brutes have a buff in health, recharging speed, and shield strength. Brutes have shield flares and Chieftains have their own shield flares.
Elites got animations for melee for the turret, and a proper rifle melee animation, as well as a restored sword melee animation that never played in vanilla Halo 3. Jackals have custom shaders for the Minor Shield and Major Shield colors, and no longer cover for so long after being surprised. Hunters have two variants: the standard blue Hunter with the particle cannon, and a bronze Hunter with a flak cannon. Elites have more ranks now. (Stealth, Ultra, Zealot) Minor, Major, and Spec Ops elites, which were part of the base mod, are also in this mod, slightly tweaked for strength and accuracy. Berserk properties have been modified for Brutes, Elites, and Hunters. Grunts now have a melee attack that they rarely use, although Heavies are the only rank that can regularly use it (it's their smash debris animation). Elites dual wield needlers and plasma rifles too.

The Battle Rifle has a 3 round burst firing mode when unzoomed and single fire mode when zoomed.

The Brute Plasma Rifle has been tweaked for damage and battery heat buildup.

The SOCOM Automag's firerate has been increased but with slightly decreased damage.

The Assault Rifle has a firing rate acceleration and faster projectiles that go as far as 80 WU.

Assault Rifle bullets travel faster.

The Magnum has an increased damage and accuracy with a faster firerate but no scope.

The Mauler has increased bullet impact damage, and decreased spread.

The Player has a grenade capacity for 4 grenades of each type.

Energy sword does more melee damage.

Player melee damage is decreased.

Player melee damage is decreased, except for the brute shot, sword and gravity hammer.

Truth's Gravity Throne can be EMP stunned.

Drones work properly in gameplay and combat.*

Chieftains can now use invincibility properly.*

You can now spawn AI in multiplayer through the forge menu.*

Known Issues:

-Flickering in certain areas of the map due to the sheer amount of scenery in the map.

-Map may sometimes randomly crash due to as of yet unknown reasons.

Enjoy the mod and be sure to add more stuff and AI if you want!

Also, don't forget to make backups of the map files included in this mod.***