After today's patch Bungie has nerfed the ability to farm Omnigul. From the patch notes: "Omnigul will now drop rewards once during a Strike and will require the Strike to be finished to drop additional rewards." #RIP
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She was a waste of time to farm anyways unless it was pre RoI and going for grasps. Honestly Its quicker to just run regular heroic strikes or just farm shield bros etc..