So I ive been reading playable species threads and It gave me an idea. In the “Gears of War” series they have whats called “beast mode” which is essentially a reverse firefight. You must play with varying species to overrun and kill the human A.I defense. You have a limited amount of money to start off with. You must purchase each specie and have one life. As you rack up kills you earn more money. Their are several tiers of species to choose from in which you have to rack up kills to unlock and buy the higher tier species. Higher tiers consist of more deadly and durable species but cost much more money.
So I was thinking halo could have a game mode like that for example: You play as the storm covenant and prometheans to kill the unsc base which is fortified. There are 10 waves of enemy A.I, each wave consisting of more and difficult UNSC A.I.You must beat each wave under a time limit(killing enemies results in time bonuses) or its game over as well if your entire team has insufficient funds.
You start the game with say $250
TIER ONE TROOPS:
(Suicide grunt($25))equipped with plasma pistol and the ability to suicide in which the grunt has 200% movement speed, 110% health and activates 2plasma grenades that will detonate within 6 sec or win in close proximity to an enemy.
(Spec ops grunt($50)) equipped with a needler and 1 plasma nade to throw
(Prome crawler($50))equipped with boltshot(can’t overcharge) and the ability to adhere to surfaces for a limited time.
(Jackal($75)) equipped with weakest defense gauntlet(blue), plasma pistol,and limited Sprint
(Jackal major($100)) equipped with strong defense gauntlet(yellow), plasma rifle and limited sprint.
(Prome Watcher($115)) equipped with boltshot(can’t overcharge), unlimited flight, limited hardlight shielding of allies,
TIER TWO TROOPS:
(Skirmisher light($150)) equipped with needler, can jump extremely high, sprint and evade
(Elite minor($200)) equipped with strom rifle,2 plasma nades,minor shielding,can sprint and evade
(Engineer($250)) can give energy shielding to itself and allies, unlimited flight.
I got tired of thinking of the currency.
(Brute minor)) spiker, 3 spike grenades, sprint, evade, alot of health
(Skirmisher major) needle rifle, extreme jump height,sprint,evade, wrist gauntlets, hologram
TIER THREE TROOPS:
(Spec ops elite) 2 plasma nades, active camouflage, energy sword, plasma pistol as sidearm,sprint,evade,medium shielding
(Brute captain) 3 spike nades, gravity hammer, extra health,sprint,evade
(Drone leader) unlimited flight,brute plama rifle,minor shielding
(Promethean)minor shielding, suppressor, prom vision,2pulse nades personal hardlight sword,sprint
BOSS TIER:
(Elite Councilor) heavy shielding, 4 plamsma nades,sprint,evade, minor active camouflage,energy sword, dual plasma rifles
(Brute Chieftain) heavy health,minor energy shielding,3 spike nades,sprint,evade,gravity hammer, spiker,
Brute war chieftaun) heavy health, minor energy shielding, 3 spike nades,sprint,evade,plasma canon(or fuel rod gun),
(Hunter pair) standard weapons and abiliteies, the player can command the second hunter A.I
(Promethean battlewagon)medium shielding, limited teleportation,prom vision, hardlight shield,sprint,3 pulse grenades, incinerator canon
Side notes:the abilities I mentioned, some are base abilities such as (sprint ,evade) others are limited and recharge over time. Players can decide to switch from third person or first person.The enemies could consist of civilians with guns,police, marines,odsts,spartan IVs,Spartan IIs, etc. This game mode would allow four players to take on the enemy A.I only.
This is my take on playable species. Let me know if you like the idea,have any improvements, additions, or would like to remove something. Lastly thanks for reading this took a while to post.