Rengars passive needs a cooldown
I'm honestly not even sure whether or not it does, but it can't be anything longer than 1-2 seconds. Literally, whenever I have a fight with rengar, he just dissapears into brush (becoming unattackable) and then reappears right on me.
People say "just ward the bush" or "go in the bush" well
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It's very easy to have no wards available early-game (which is when this bs happens)
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He will legit kill you before you can even get to the bush. Or, he can stop you from moving and thus you cannot enter the bush.
Give it like a 4-5 second cooldown so that it CAN BE USED MULTIPLE TIMES PER FIGHT but CANT BE USED TO HAVE HIMSELF DISSAPEAR THEN REAPPEAR RIGHT NEXT TO YOU EVERY 1-2 SECONDS.
That is all.