Well I think where everything went wrong is in designing the weapon and vehicle pools. In Halo we had two different types of weapons pools, the UNSC which used the very familiar projectile weapons that our current firearms utilize today, while the covenant used energy based weapons with internal batteries and a heat system to replace clips. The exception was the needler but it was given a different mechanic to make it appear more sophisticated than our crude designs. But there you had 2 pools of weapons, UNSC which was complete weapon set and the covenant which was very much a partial set. Neither vehicle poll was completed.
In Halo 2 you added a new poll which was the sentinel beam and now forerunner weapons could be used, although it acted very much like a covenant plasma rifle. The Covenant weapons and vehicle pool was completed while the UNSC still did not have a flying vehicle and the scout vehicle was moved to the next game.
Halo 3 they finally completed the UNSC vehicle pool with a flying weapon and added in a new pool, the brutes, Now the brute weapons were very close to the UNSC and only had extra melee damage to make them different. Neither vehicle or weapons pool was complete but when combined with the covenant weapons pool and even removed some overlaps it was a complete vehicle and weapons pool.
Halo Reach (which I still argue is the best) had a complete weapons and vehicle pool for both UNSC and Covenant. Further more when designing the game they realize that everything was complete so for new weapons they worked on more of a specialist weapon role. It wasn’t a weapons with so much power that ammo had to be extremely limited, but it wasn’t a weapon with so much ammo that it could replace your mainline guns. Not to mention the different pools mirrored each other in a way that fit the asymmetrical balance between the two warring powers.
Enter Halo 4, the Prometheans, Now their weapons acted very much like the Brute and UNSC weapons and they did have a full weapons pool (I will explain later) but no vehicles. Now given that these enemies can just teleport it is reasonable that vehicles don’t suit them as they can instantly pop in from around the world to a different ship. I mean you didn’t see any cars in Star Trek since they had transporter beams (not counting Nemesis which copied so much from Halo).
Halo 5 gave the Prometheans a single flying vehicle and just made powered up variants of the other weapons. Nothing was new except for pay2win Req packs and a vehicle that also included a better one hidden in the lootbox system.
So this is what I call a full weapons pool
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Pistol (one handed) - Automatic - Close Quarters - Mid Range - Sniper - Explosive/Anti-vehicle - Grenade (secondary)This is what could be added to the weapons pool
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Heavy Pistol (hand cannon) - Akimbo automatic (dual wielding) - Melee (sometimes used in place of close quarters) - Mid-long range - Dual Purpose (anti-infantry and anti light vehicle, like the brute shot and sticky launcher) - Utility (low damage but does have effects such as EMP or concussion, examples are the Reach grenade launcher and concussion rifle) - Guided Explosive - Orbital (the target designator, too bad the covenant doesn’t have one like a cleansing beam from Halo Wars) - Mines/Area Denial (secondary)This is what I would call a complete vehicle pool.
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Scout (fast) - Cavalry (carries passengers) - Heavy (tank) - FlyingThis is what could be added to the vehicle pool.
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light anti-vehicle - anti-air - transport - aerial transport (not drop ships as I consider them a different category and believe they should remain AI controlled).As I have said before we have 4 different sources for these pools. Only 2 of theses sources make a complete vehicle pool and only 3 has a full weapons pool.
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UNSC - Covenant - Brutes - Forerunner/PrometheanNow I made some threads about weapons and vehicles that would incorporate an aesthetic similar to the Flood. But when coming up with that concept it was those complete pools that came into mind. Now there pools don’t need to match each other one for one, example there is no need for a UNSC melee weapon and the Covenant Sword and Brute gravity hammer fill the close quarters role with their melee weapons but the brute still has their mauler. But they do need to fill the basic rolls lifted above and could have the optional roles to fill in the gaps. Now as you see with the other 2 or 3 different sources of weapon and vehicle pools there is plenty of room for 343 to design new weapons. They just have to make sure that the weapons are unique compared to the weapons in the other pool. There is even room for some UNSC and Covenant designs. Of course it would be easier to fill the gaps in the Brute and Promethean weapons (or make a new faction with a complete pool).
Here is an idea for a new utility weapon in the covenant pool. I call it the Plasma Disruptor. It is similar to the grenade launcher form reach, instead it fires those overcharged green plasma pistol bolts. It can fire more bolts than a plasma pistol can fire overcharge. Holding down the trigger doesn’t drain the battery but it does increase the heat so sooner or later you will have to let go. It’s purpose is to break shield/power armor and disable vehicles. Does very little damage to armor/health. Here is one for the Brutes, A Disc Launcher. Supposed to be an anti vehicle weapon it launches spiked disks that can stick to walls or the ground. when it comes into contact with a vehicle or player it explodes. You could use it to lay a quick minefield in a path of a speeding vehicle. The discs will explode after a delayed time (like 30 seconds) but as you see there is an anti-vehicle weapon that is different from a rocker launcher, fuel rod cannon, plasma launcher, spartan laser, yet it fills the same role.