For the new Forerunner (or old for them) weaponry I think a shotgun the shoots something like blobs of plasma. I know this is kind of taking from the Star Wars: Republic Commando game but add a few modifacations to it and you have an original kick ass weapon. Like for instance you could add the blue Sential beam to as an alternate way to fire the weapon. So for the Forerunner version of the shotty you got a close range and a medium to long range solution to take Flood. Because in case you haven't tried it but, a Shotgun/Sential Beam weapon set up kicks ass (especialy if it's the blue beam not the orange one). Another thing is that seems how the Forerunners like their technologies so much why wouln't they have robot fighters equipped with a weapon like the one I just mentioned. So if Master Chief or the Arbiter every get to the Ark the robot guys would gaurd it instead of the sentials. That would change things up quite a bit in the fighting aspect because they have a means to take either one of them out at almost any kinda of range. Make these robots super intelligent and you got a big problem of your hands. Those are just some ideas but it would be pretty damn cool to have new enemies that aren't something you'd usually fight. [Edited on 6/17/2005]