Big Guns – Titans
There a lot of weapons in Destiny, however, we don’t really have a sub-class that focuses on specific types of firearms. Given the Titan has always seemed like a class that prefers heavily artillery, so why not give benefits for using weapons like rockets, shotguns, and machine guns. This would allow for a deeper level of customization for specific items beyond the base nodes. However, a super that summons a giant chaingun or rocket launcher that can be used for a very small period of time would be quite a sight to see.
Obviously, Bungie would need to make sure that a weapon focused sub-class is balanced for PvP, as it could offer a distinct advantage to those who use it. However, this could be adjusted by the removal of melee or grenade based powers. Users could also be slightly slowed when using specific weapons that are powered up, in order to not push the power level beyond reason.