Buff the exotic perk.
One way or another: Precision kills increase agility and armor by 1. Increases damage by 6.67%.
Lasts 10 seconds and stacks up to 3 times.
Inb4 someone says it is good enough as it is.
Edit: lol
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The end perks should be usable at the same time. Except stacks of one cancels out the other stack.