Varus's Passive Should Proc Off Allied Deaths Instead of Enemies
Would make more sense being the Arrow of Retribution.
Retribution: punishment inflicted on someone as vengeance for a wrong or criminal act.
New Passive!
Living Vengeance
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On the death of a nearby allied unit, Varus gains a stack of Living Vengeance. Upon reaching 3 stacks, his next basic attack grants 20% bonus attack speed for 3 seconds. On the death of a nearby allied champion, Varus gains 40% attack speed for 6 seconds. These bonuses do not stack with themselves.
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(Any Living Vengeance stacks gained will not be consumed during the 40% attack speed buff and can still accumulate during it.)
How close he has to be to a slain unit and how many stacks he needs are variable numbers.
This all shifts him more towards "defensive and vengeance-based" from his current "offensive and snowball-based", which is a very overused concept/mechanic in the marksmen role.
There'd also be an animation where the bow lights up for a moment whenever a unit dies near him.
VENGEANCE! RETRIBUTION!