All the campaign Vehicles like the Pelican from the mission Shutdown or the Broadsword from Midnight or the civilian vehicles and the Mac Turret from Halo Reach. All the props and objects from the campaign as well like dead marines, unique objects, destroyed vehicles etc.
Finally the most biggest thing is FORGE AI! And before you say it’s not possible have a look at Far Cry 4 editor mode, 343i probably did the Spartan Ops missions with Forge mode like placing down Props and such. All you would have to do is set simple custom objectives like Defend a generator/area or Kill all enemies like in what they did in Spartan Ops to make it work. Of course if you put a load of blocks and walls every its not going to work and the AI will get stuck but in generally open areas they will work fine as Halo’s AI behaves in a sandbox’y way. Imagine doing mini-battles like 20 Hunters vs 10 scorpions or something crazy like that. That would make Forge at least 100x times more re-playable and FUN, i’m not even exaggerating.
Anyone else agree? I think it would make Halo 5 GOTY. I don’t understand how someone could possibly disagree with this other than ‘limitations’. Yeah right, Far Cry 2/3/4 could do an AI editor on last gen consoles with nowhere near the same amount of specs as a Next-gen console.