How to buff Kha'zix's evolved R
There have been numerous ideas about how to improve Kha'zix's evolved ultimate, as it's been really lackluster since they removed the damage reduction on it.
A simple way to buff it would be to reduce the recast to 1 second, like his unevolved ultimate, but that should just be the starting point. Even if it was 2 seconds of stealth with a 1 second middle part, that still doesn't make it worth evolving over Q damage, W slow/vision/waveclear, and E resets.
In addition to that obvious buff, what if evolved R actually buffed his passive? That's the main reason to evolve R is to get numerous passive procs on somebody, going out of vision to get the extra damage and slow.
Currently the passive reads: Unseen Threat causes his next basic attack against an enemy champion to deal「 15 - 190 」(+ 50% AP) bonus magic damage and slow by 25% for 2 seconds.
What if evolving his R were to evolve his passive as well, changing the ratio to something like 30-40% AD? That way, a more assassin-based Kha'zix that builds a pretty typical build of 300 AD at level 18 would get three procs of 190+(90 to 120) damage. Another option would be to lower the ratio, but make it true damage (He is the only void-born creature that doesn't deal true damage somehow).
between stealth that granted 50% damage reduction. Now that evolved R doesn't grant damage reduction, why the hell wasn't the re-stealth time reverted?!?