Garen Ult suggestion

I've been thinking a bit about garen lately,
He's ment to be the entry level top laner for new players and has a decent laning phase but terrible late game.
So what could be added to make his late game or his role in the team a little more meaningful?

Well lets start with what part of his kit(besides his W) is the most.. i wanna say boring?
His Ult
While the sfx for his ult are awesome, it's really just a Nidalee Takedown on a higher cooldown that cant proc lifesteal.
Now when I got thinking about the sfx on his ult, i thought about how awesome it looks when he successfully executes someone!

There is this MASSIVE explosion, that when you see it, leaves you in awe at how magnificently mindblowing it looks.
Now stay with me on this, what if his ult had an AoE effect upon successfully executing someone?
His late game/teamfight is pretty poor atm, so what AoE effect could be added? Why CC of course!!!
Now the question is, what CC would fight this massive explosion?
A stun to simulate how... stunned they are at the scene before them?
A massive slow because of how shaken the ground beneath them is?

I would leave this to the balance team to decide since, well im not an expert on this.
If a rioter could please respond to this and give some thought on the idea, it would be absolutely fantastic!!!