I made this for a stream I did. I'm mainly uploading it for the people who watched the stream to try out. I didn't put a ton of polish on this. Each level has a different mod to make Chief's kit even better, and in all levels he's FAST. (Like in the books) I recommend using the infinite ammo skull, Bandada with this mod.

Sierra 117 - AR shoots rockets. Chief is 3x as fast.
Crow's Nest - An improved flamethrower is given at the start of the level. Chief is 3x as fast.
Tsavo Highway - Chief is 10x as fast and won't die to collisions. No other changes.
The Storm - AR shoots AA Wraith bullets. Chief is 3x as fast.
Floodgate - An improved Gravity Hammer is given at the start of the level (Large range, more damage, it's a bit inconsistent though). Chief is 3x as fast. Flamethrower is still improved too.
The Ark - You start holding a pistol that shoots tank bullets. Chief is 5x as fast and can jump higher.
The Covenant - Your laser at the start shoots it's full beam constantly (It's loud). Chief moves 3x as fast and maybe jumps higher? I forget and I am too lazy to check rn
Cortana - The shotgun has a much larger range and shoots more bullets. Should be effective at fairly long ranges. The flamethrower is also still improved and in the same spot as normal. Chief moves 3x as fast.
Halo - There is a laser near the crashed pelican at the start that shoots 343 Guilty Spark's laser out of it. The laser actually kinda sucks ass so I made all of the enemies have like no health (Only on Legendary because I was only doing Legendary for the stream, on other difficulties the enemies have a normal amount of health.) Chief is 3x as fast and has an improved jump.