Ok prep for detail bombs in these suggestions. Suggestions will range from simple to complex with each having an explanation for its use in gameplay and lore.
Plasma rifle
https://www.halopedia.org/Type-25_plasma_rifle
An outdated weapon by even the covenant standards but an old go to either way. The plasma rifle in infinite will function closer to its CE counterpart having a stun effect on targets hit.
weapon type: SMG
TTK: 12 shots (3 seconds)
ammo: 80 shots
effect: slows turn and movement speed of Spartans hit for 0.5 seconds effect doesn’t stack though resets on hit.
Storm rifle
https://www.halopedia.org/Type-55_storm_rifle
A modern take on the plasma weapons, rare in the field sense the fall of the storm faction though some sanghelli weapon smiths have taken up production, its ability to fire while venting heat makes it valuable for suppressing targets.
weapon type: rifle
TTK: 8 shots (2 seconds)
ammo: 80
Function: an AR side grade, where the plasma weapons generally require venting the storm rifle does not, though the more heat it has the more likely it is to fizzle costing ammo with out firing a shot. Pace your rounds and be warned firing from full heat has a 20% chance to waste a round.
flamethrower
https://www.halopedia.org/M7057_flamethrower
https://www.halopedia.org/NA4_flamethrower
Old outdated and generally used to clear fulliage this weapon is the king in close range, able to damage everything in its cone of fire as well as light the ground a flame dealing DoT. Unlike older models the more modern version is lighter weight and doesn’t require a crew to operate. the down side is it has to be sent in to a factory to reload.
type: Suppression heavy
ammo: 100%
fire rate: 10% per second.
function: area denial and punishment similar to the shotguns, only as a power weapon it has the ability to damage many targets at once. the DoT it deals will melt a spartan with out shields, and prevents shields from recharging while burning, though it doesn’t lower them unless directly applied.
M57 Pilum
https://www.halopedia.org/M57_Pilum
Originally designed to replace the spnkr, the Pilum is a 2 shot rocket launcher that specialized in anti air fire. Unlike the spnkr it lask the 2x smart link scope, instead having an anti air lock on system. To accommodate this the projectiles are AP instead of HE meaning they deal less splash. only killing a spartan on direct impact. That said the Pilum can bring down a banshee in a single shot.
Type: launcher power weapons
TTK: 1 shot (depends on range)
ammo: 2
roll: power weapon version of hydra designated AA.
M739 SAW
https://www.halopedia.org/M739_SAW
An UNSC suppression weapon, the saw is known for sending a lot of lead down range really fast, taking out targets with volume of fire alone.
weapon type: suppression heavy
TTK: 12 shots (2.5 seconds)
ammo: 100 shots per mag (one spare.)
function: a pure upgrade to the AR found as a power weapon on some maps. at long range it looses accuracy but is good for knocking targets out of scope.
MA5B /w GL
https://www.halopedia.org/MA5B_assault_rifle
https://static.wikia.nocookie.net/halo-spv3/images/9/96/Assaultriflegl.png/revision/latest?cb=20170801035634
Old, out of date, and using slightly under powered ammo compared to other MA5s the MA5B is a go to light LMG for those who like it. While not a standard weapon some spartan special ops have requested them and their rarely seen under barrel grenade launcher.
weapon type: suppression heavy.
TTK: Same as MA5 in current game
ammo: 60 rounds /2 rounds GL
spare ammo: 240 rounds / 2 rounds
function: While it lacks the ability to smart link, the under barrel GL more then makes up for it, this being a tactical upgrade of the MA5 found in custom games, and as a power weapon on some maps.
Ok to round things off, I will inform of the idea behind the suppression heavy class of weapons.
Suppression heavy is a power weapon slot designed purely for BTB and campaign, built around dealing damage or suppressing large groups.