maybe for kha zix ult evolution instead of charges...

maybe in addition to what he has right now just make it that the next person he uses his q on makes it isolated without the conditions that normal isolation would have

so he would go into stealth using his ult then the next person he uses his q on would have the bonus isolation damage on his q proc even if they were close to an ally

this would make his ult evolution feel a bit more impactful leveling up and also give the whole theme of "oh shit im scared where did this alien from the void just go to???"

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