Before anyone starts saying anything negative just wait a moment please.
I am going along the lines of wanting something like a beast mode for halo, of course it won’t be called beast mode but imagine it.
you start off, holding a plasma pistol as a grunt. you and your buddies are all grouped together, one of you might be a suicide grunt, a jackal with a carbine.
one of you unlocks the next lot of units to play as, you are now playing as an elite with a selection of weapons or different abilities. perhaps you’d be a jackal with a gauntlet and proctecting your allies.
you unlock the next lot and you can now play as a hunter or brute (with the option to go berserker mode).
for the last lot you can play as the arbiter, prophet or something similar to Tartarus.
Now say your on a bigger map with lots of open space. new units are now available such as ghosts, banshees, wraiths, spirits or phantoms (and other new vehicles).
This is just my idea, i know alot of you may think it’s terrible and throw countless negative comments and abuse at me but hey, just a thought.