Hello guys! I hope you like my ideas and before reading just remember:
Because I don’t know the entirety of Halo’s lore, the following will be based only on the stuff known in the Bungie games since I have only played them. Anyways, I personally would play a Halo game like this one. If you feel like I am saying something that’s fundamentally wrong about Halo please point that out without being too offensive thought. I am relatively new to the deeper lore of the game.
As Master Chief is being dragged around space with Cortana with the spaceship’s debre, a slipspace rupture opens swallowing them and transferring them to installation 07 where they crash-land on this very newly discovered Halo ring. During the fall, Cortana just barely succeeds on waking Chief from stasis (a cool reference to “wake me when you need me”). On this new Halo ring, there are the banished that are trying to take control of the ring. While fighting the unexpected banished forces, you are trying to find what caused the rupture that brought you here. It was a forerunner scientist that denied the extinction of his spiecies and set up an observatory from random spaceship wreckage he found and that was also the reason you came down there on the ring. He had destroyed the ring’s monitor since it was attacking him. Also he needed help with the banished because they were threatening him to make weapons for them. He promises to send you back to earth if you help him. The discovery of said scientist happens at the end of the first mission of the game whilst on the first one you are trying to find shelter and, sorry that I forgot to mention, your armor’s shield function is damaged from the fall and gets repaired by the scientist. By the way, you are being chased to the front of the door of the observatory whilst the defensive turets that the scientist made, save you. The backstory of the scientist mentioned above is being discovered through SHORT expository dialog through out the game and with references to past experiences of him like him saying, sorry for that -Yoink- line, “this looks like that time I did that to that damn sphere!”. The shield system is upgradable by the scraps of your enemies. You can ask for special tools but they are expendable (like a bubble shield) and you can also find them on the field. However, you have to go to the upgrade station that the scientist always caries around. The end goal of the game would be to find a tool that would make the possibility to send Chief to earth since the rupture needs to be far since earth is far.
