I agree TyKing. I was going to wait to unveil our primary mission in thread but, maybe I should just tell you guys what I had in mind right now.
Ok, so, we already have that the Covenant are searching for something. I was going to have that it was another lost Forerunner Ship, not the Ark. This ship was going to have all kinds of information on the galaxy, what planets are habitable, what they offer, what planets have intelligent life on them, maybe even some left over weapon cache locations, ect. I figured this would be a good main mission because the Forerunners were one of the, or the, most powerful advanced civilization of their time, so I figured they'd have all of that. The wealth of information this ship was going to have could possibly change the outcome of the war with the Covenant, and mankind's survival. And seeing as how the Covenant worship the Forerunners and collect their artifacts, they'd naturally be driven to find and claim the ship. Thus we'd have a race with the Covenant to find and claim the ship before they do, the thing is, they already have a head start. I haven't mentioned this in thread yet but, right now, the Covenant are scanning every inch of the city to find the best spot for a hidden ship.
The battle for the Forerunner ship was gonna be big of course, so I wanted everyone in their top fighting condition and right now, we're all pretty banged up from just trying to survive in the city, which I love because it's realistic. Another thing to take into account though, beyond searching for team mates is finding food and medical supply sources as we explore the city.
It's not set in concrete but, that's what I had planned. I'm willing to discuss other ideas, and we should discuss them if anyone has a suggestion.