I play Chroma most of the time , but that ' s not my usual build since I have lens on my important weapons . I hardly ever do missions to farm affinity unless I ' m leveling something . What I would try in your position is Aura Energy syphon OR shield disruption Exilus Power Drift or range drift mod Vitality Steel Fiber Blind Rage Energy conversion Primed continuity Constitution Streamline Stretch against Corpus . Find a survival with a fissure and try to get as many kills as possible with Effigy or Ward . The build might need some tuning based on experiments . Actually forget I said anything about Infested . I am trying out some builds as we speak and Ward builds seems to be shit . Come back to you if I find something interesting .