So basically I think it could be about the insurrectionists coming back harder than ever and using banished tech to attack the UNSC, and they brainwash the Master Chief to join them and go rogue (hence the name "A Knight's Downfall") and the UNSC makes Spartans with abilities on par with the Chief in a desperate attempt to take him down, because if they don't, he can end the entire UNSC. the people working on this can have their OC's be those special spartans. The insurrectionists will also start brainwashing other spartans to be on equal turf with the UNSC, so some people can make those characters. Special Spartans have the same abilities as a normal spartan, except slightly improved in all areas. But they each get a crazy boost in one stat, but one weakness. (For example, my OC is able to go fast enough to break the sound barrier, but has weaker armor, and lower defensive capabilities.) Also I think different people working on the perspective of different characters would be dope.
I would like to be the composer for soundtracks and work on art with others, and also writing.