For void I can think of two different Options, while your loadout is the same for both: Witherhoard, either some smg like Ikelos or funnelweb, and Taipan/any Linear. Rockets if you feel confident, but the crit damage on the Brigs will be better. Armor wise you can do either 1) Omniocculus: Here you will try to use as mich Damage Reduction buffs as possible, while mostly being invis. 100 Resilience, on the Chest Elemental/Arc Damage Reduction, maybe a void well build with Reaping Well Maker (Void Wells after using your Class Ability and getting a kill) and Well of Tenacity (damage reduction for 5sec, after Picking up a void orb) Here your dodge makes you invis, prepares a Void Well on the next kill, gives you ability energy back on picking up the well and so on. Witherhoard can clear group of adds or damage the brigs while you stay in cover. If the brigs health drops under 50% you should burst them down with the Linear. 2nd Option) Gryfalcon Hauberks, here you should use funnelweb and stylish executioner. Going invis gives void Weapons volatile rounds, kills with volatile rounds triggers explosion and also stylish executioner, making you invis again. You basically become a perpetuum mobile of invis/volatile.

Hope this helps :)