i do believe i’ve got this figured out thanks to whoever it is from 343 that said the new enemy will be able to “adjust” and change during battle to become stornger.
the new enemy IMO will be the forerunner’s AI, not just a single monitor but the entire forerunner AI system as a race if you may, gone rempent for some reason because i remember that some sentinals are able to combine with others during battle to become stronger and i’m not talking about transformer like beings but more like the key ships (i think it was the key ships) who combine theyre fire power to become more deadly, something like that and that will force you to become smarter every time you face a group of enemies because in some you will take them down one by one like you know but in some you will have to reconsider your tactic and focus on one piece of the enemy, a single unit that operates as the head of the snake and once you’ve removed that unit they fall down quicker and it can bring some cool mini boss moments. i’m not saying go hack and slash here but these could be very cool.
why would this happen? the master bulider. he’s got the AI under his influence and has led them to believe that his new super weapon will cure the univrese of precusor’s or what not. these machines, as always are pointing the gun at the head of the universe.
how do you fix this? dahhh! the nice blue lady of course.
the librarian has brought the dawn on to requiem using geas as we’ve come to know, no real clue how, in order to contain the AI outburst (see how i’ve replaced the flood with AI? i’m so proud of myself.) and in order to do that she needs a protocol or something that was lost with instellation 04 but lives on inside of cortana. maybe has something to do with the forerunner cosmic data network that does not operate as it should or whatever, and she needs to extract it from cortana and the chief needs to take it to an AI core of sorts and in between he has to bring the senghilli and humans who followed him there together in order to supplay him with -Yoink- rail guns and tanks to plow his way to the core.
the final battle will be the chief in a battle spheinx, flying towards the giant center of requiem in a independence day like final aireal battle, backed by the infinity’s forces, landing in the place he needs to go to, taking down the master builder and cure the forerunner’s AI and by that, gain them as allies for the next games.
in return cortana is healed in a special way that only the librarian knows and then in the end we find that the didact/bornsteller is being held captive and that is the next game’s clue. the librarian in a way also becoming your “superior” in colaberation with
the UNSC, coming in to conflict with ONI who wants more anceint tech and power.
in more of a free flow about the future, the antagonist in halo 5 and 6 has to be a a second generation spartan thought to be lost and has a grudge against mankind for his life. not sam or james! theyr’e sacrifice and legacy should never be tainted and will alaways lead to chief in the right way.
because john will more inrospective in the years to come i guess that will seriously put everything he thought he knew in to conflict with the universe that is changing and force him to go commando to do what what he believe is the right thing, not necessarily what his orders are.
that is my massed up view of the future. sorry about typos, feel free to shoot it down.