We or they have the power to do this. Enough options and forge niceness to pull it off
Overall theme
Nov sprint. No powers. Normal movement and some shield tweeks. Higher movement speed (small amount )
Weapons
No prometheon (sorry)
No Hydra. SAW. Caster. New rockets. No DMR
More use or haloce pistol. Spnkr. Halo2 br
Storm rifle can stay. Only because we would need an alien gun. Carbine stays too
Vehicles
Pretty much all except mantis and phaton (spelling). More warthog and ghost usage
Player stuff
no sprint. Climb. Slide. Hover. Anything new
Movement speed up to 110 or 125%
Health up slightly to increase killtimes with slower shields to prevent people feeling too tanky.
AR+pistol starts (br for big)
concerns m8
maps wont work: Use remakes of old maps. Or use all maps for some modes. Slayer use remakes. BTB use anything
We would need sprint etc: Nope. Higher base speed and proper tweeks it would change halo5 but not ruin it
Why no prometheon guns or etc: Not classic. Trying to keep it closer to original trilogy. With some mild tweeks