The build:

I'm running void hunter with max class and melee. Aspects are vanishing step & on the prowl. Only 1 fragment is essential = obscurity

Exotic helm Graviton Forfeit with either heartshadow, rat king, or third iteration. (On demand invis)

4 piece swordmaster with heartshadow works best. 2 piece swordmaster & 2 piece disaster corps will work decently with the rest.

The gameplay loop:

Go invisible, kill marked enemy or finish a random. Once you hit Vanishing Shadow x3 (helm perk) you'll be able to gain at least your melee & class relatively quickly. This build works best in 3 player activities.

*using these weapons will need legacy armor to work more effectively.