What would you like halo reaches forge is amazing but somtimes hard because of objects that can't be made and map areas add some ideas like
Light bridges
Water
Under water breathing tools
More buildings
Item skins like unsc and forerunner
Zero or little gravity zones
Anti vehicle shield door
Mac guns (admit it that be cool)
More effects like lights
Ground effects like sand and grass (lava?)
Firefight
Destructible walls
Trees
Moving objects cars, lifts, etc...
A.I.s
Automated turrets
Mini campaign missions
Come up with some!
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Fine OP, I'll throw you a bone. A.I. would be nearly impossible in Forge, however I was thinking maybe something along the lines of dead bodies (UNSC, Covenant, Flood, new enemy in Halo 4, etc.) Also, blood splatters would be interesting. What about already blown up vehicles (Instead of just flipping them.) ODST/Covenant drop pods.