The roll is heal clip with incandescent. You can get heal clip with everything else but incandescent?
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Certain perks are most likely weighted, to keep you farming. (Like Harmony) I tracked around 50 drops recently, just over half of them were duplicates of one perk combination or another. I even had a certain perk combo drop 4 times. A ton of other perk combinations never showed up. Buddy of mine did the same with roughly the same result. Got a heal clip/incandescent roll around my 60th-70th drop