I made a thread similar to this before, but it lacked an elaboration on my part which was a negative for me personally. This is my second attempt. Now I enjoyed my time with Halo Wars, be it as short as it was considering I have so many other games occupying my time.  It is a good game, but it gets dull, only my opinion. I wanted to play as the Flood as soon as I had heard they were in the game, but it didn't happen. So I was thinking, could a possible expansion or new game about the Forerunner-Flood War using the Halo Wars formula possibly be released by  Robot?

I think it would be successful because...

1. It offers a new, as of yet shown story of the Halo Universe.

2. The Halo Wars formula shouldn't go unused as it still has plenty of potential.

3. Canon inconsistency would be low as this war has yet to be fully revealed.

4. It could be kick ass.

Below is a list of the features I think would be appropriate for the game. It is long so grab a soda and a snack.

Forerunner Empire

Forerunner Infantry

Forerunner Solider- Armed with a Forerunner Plasma Rifle (Acts as the Marine/Grunt of the Forerunner army.)
-Can get Defense Gauntlet, Medic, and Personal Shielding Upgrades.  

Forerunner Sniper- Armed with a Plasma Sniper Rifle (Acts as the Jackal sniper of the Forerunner army.)
-Can get Optical Zoom, Defense Sphere Drones, and Stealth Shielding Upgrades.

Forerunner Plasma Cutter- Armed with a Sentinel Beam-like weapon that fires concentrated beams of plasma. (Acts as the Hellbringer, Flamethrower unit, of the Forerunner army.)
-Can get Heavy Armor, Improved Torch, and Dual Cutter Upgrades.

Forerunner Heavy- Armed with a hand mounted Plasma Turret. (Acts as a heavy weapons specialist.)
-Can receive Improved Turret, Line Of Sight, and Grapeshot [think shotgun] Turret Upgrades.

Robotics

Sentinel-Fires a standard beam.
-Can be upgraded to a Sentinel Major getting a stronger laser and gold plating.

Super Sentinel-Can slow down enemy units and have a more powerful sentinel beam than the standard Sentinels, can't attack air enemies.
-Can receive a anti-air mini-turret.

Constructor-Can repair Forerunner buildings, and other Sentinels.
-Can receive personal shielding.

Buildings

Forerunner Fort- The main part of the Forerunner complex.
-Can receive defensive turrets, purchase super weapons, and self-destruct.

Barracks- Spawns Forerunner infantry and provides upgrades for infantry.
-Can receive the Recruitment(More infantry, Bio-Tech(Increases infantry performance, and all other infantry upgrades.

Sentinel Shop- Produces Sentinels and Sentinel upgrades.
-Can receive the Reconstruction upgrade to unlock the Sentinel, Super Sentinel, and Constructor upgrades.

Forerunner Supply Elevator- Produces supplies.
-Can receive the High Maintenance upgrade twice to get more supplies.

Forerunner Reactor- Increases tech level.
-Can receive the Enlightenment upgrade three times to boost your Tech Level.

The Flood

Luckily, the Flood were easier to work with as plenty of established units exist in Halo Wars. Unfortunately, they would most likely lack upgrades due to balance.

Infection Form- Can infect Forerunner units

Combat Form- The infected forms of Forerunner Solider,
Forerunner Sniper, Forerunner Plasma Cutter, Forerunner Heavy.

Carrier Form- Hold Infection forms and explodes near the enemy.

Flood Thrasher Form- Kills Sentinels, so it is anti-robotic.

"Air" Units

Flood Swarms: Can emit dart-like projectiles to puncture enemies.

Flood Bomber Form- Drops Flood Pods to infect enemies.

All Purpose Units

*As seen in Halo 3!

Pure Form- A special Flood form that transforms into three separate forms.

-Stalker Form: Fast and agile, used against infantry.
-Tank Form: A large hulk of a Flood form, used against infantry and buildings.
-Ranged Form: A spiny Flood form that shoots barbs, can be re-prioritized to be a Sentinel killer.

Buildings

Flood Colony: Acts as the main portion of the base, houses a Proto-Gravemind.

Flood Barracks: Organic structures that ceaselessly churn out a variety of attackers.

Flood Root: This form appears to be a defensive unit that "whips" enemies, acts as a replacement for a turret defense.

Flood Den: A medium-sized building form which Flood Swarms Flood Bomber Forms come out of.
   

Frontline Buildings

Remember that Forerunner Spire of Healing and those Flood Pods that explode and Flood rush out? Now on the battlefield, certain post can be seized and these can be built adding more territory to your total army.

Leaders

Only a few key players have been mentioned thus far in the Halo universe, but here are a few.

Forerunners

-Didact
-Offensive Bias

Flood

-A Gravemind
-Mendicant Bias

Missions

Again, not man actual named missions are given as of now, but are hoped to be told with the upcoming Forerunner book trilogy due out anytime. However, most missions will have to occur near the end of the war and the activation of the Halo Array. One flashback mission, made to flesh out the wars background, can be named.

-G617 g1


Conclusion

Admittedly, this list may seem rather bare in comparison to the Halo Wars units and upgrades. It is hard to make a comprehensive list of things for this kind of war with the little knowledge I have of Forerunner technology. I had to go with the things I knew, some creative thinking, and what would be logical. All in all I hope you enjoyed it.