This was a deleted idea from Halo 3, aparently a PvE massive experience that I’ve ever dreamed and I thought we were getting with Reach when they shown Halo Reach’s “On the Tip of the Spear” mission start video and Halo 5’s Warzone:
Halo 5's Warzone Firefight has some massive moments but the difficulty shows when you are in the hardest mode and you only can camp in the distance with tanks and pray for your teammates to do so. It would be great to have some massive PvE, like 16 players playing campaign like objectives in a difficulty similar to heroic in which you aren't just too soft, but having so many enemies that it is required to cooperate to distract or reduce enemy troops and have other players hitting the objectives. And of course not depending on REQs.This could be possible with the New Game engine Fingers Crossed. I like Big battle.
If they could do something like that Global Battle mode in Infinite, and make it good, that would be my cue to immediately grab the Legendary Edition for Infinite, assuming they have a similar limited edition release thing.