Cho'gath Q Idea
Was talkin' about this on another thread, so I decided to go ahead and make a nice little diagram and do some math.
Keep the name Rupture since it still sorta fits:
After a 0.3s delay, Cho'gath stomps on the ground. Enemies at the impact site take 50% bonus damage and are rooted for 1s, and enemies in the surrounding crater take 25% bonus damage (but are not rooted). 0.325s later, enemies at the crater's edge are damaged and knocked up for 1.5s. [Damage numbers would remain roughly the same as they currently are for the outermost portion of the cast and the bonuses would scale accordingly, plus the delays add up to the delay on the current Q]
So the visual would go: Delay -> Heavy ground damage in the inner circle + lighter ground damage in middle circle > delay > outer rim forms
The effect radius would match the targeting radius for his current Q, as shown. And you can see that the most area covered in the direction of a lane opponent is roughly equal to the area of his current Q, if we were to chop off the edges outside of the targeting radius and lay them out. (Which I did do, but didn't show because it looked funny the way I chopped it up.)
With this, he would maintain the knockup but also be rewarded for getting in really close after slowing enemies with E, instead.
Note: That's a max-stack sized Cho in the screenshot.