Give all champs the sejuani treatment
Nerf damage but buff stats (hp/armor for the characters that should have it).
Sej had HP and attack speed re-buffed and other minor buffs to "compensate" for the 5-10% max Health loss of damage per E on the target.
The thought came to me during my ARAM on sejuani. I did a combo and they didn't die. Infact, their HP barely moved. I was like "hmm, that's weird, my E into ult into auto or W didn't kill them... Oh yeah... Sejuani got gutted I forgot". Normally I would have dealt 40% of their max HP as damage, but instead only dealt 20%, literally 50% less damage.
It's a good change overall in the grandscheme of things, because Sejuani is meant to be a controller/tank, not someone who bursts people down while being tanky. Buffing her tankyness and attack speed to reliably do her job is a great change. I wouldn't have an issue with it, if all champions were given the treatment. Make champions actual able to fight back instead of instantly dying the instant they get cc'd for even .5 seconds.
I remember when picks like Zed and Nocturne were risky because if you didn't snowball, you were worthless. That was the risk of picking assassins. It was meant to do your job and keep the squishies in check or be a worthless pick.
Now assassins asssinate everybody, from tanks to fighters to the obvious squishy ADC because damage from runes + champions getting random damage buffs over the years to keep them in the game instead of toning down the worst offenders.
Just saying. You could nerf the damage of Khazix's Q and his ratios a bit and he'd still be good. As long as all champions were reduced in damage together. Wouldn't be hard considering when they removed the rune system from LoL, they updated everyone champions base stats by a set amount and abilities.
Can remove 20 damage from all champions per rank and the game would be a lot healthier.
Won't happen, but you know.