If you have it from the Crota raid, I suggest the Swordbreaker. It comes by default Void, and is a shotgun. Whith the buff on the shotguns from the weapon update, if you have it or get it, it will help in this. I would also try rerolling a shotgun that has elemental damage until it gets void. If you are lucky enough to get shot package during the reroll, that will help immensly. In terms of primary. Try Aetheons Epilogue fully upgraded. Don't ascend it unless you intend on using it in VoG. The default max should be good in this case. The continuos void should get at least a couple kills. In terms of heavy. Try rerolling machine guns and rocket launchers (i suggest machine gun as unless the rocket has tracking the person can jump/get out of the way if he spots it. Machine guns you can choose when to shoot and thus get more) until void, as they tend to come with Arc by default (the ones Ive gotten from HoW have). Once that is done you will have a void setup and will be unloading void masses out like crazy. You should be able to get the void part done after this.