Every champion in the game has some sort of cc, and him being able to increase the duration of being stunned, slowed, etc, is a bit fucking nuts and is going to be real annoying to play against. Are you going to buff Merc Treads back to how they were how ever long ago to compensate?
Think of 
Q with his Brittle ability, no thanks.
it's not that the tenacity on merc treads is low it's that riot keeps releasing knock-ups which are not affected by tenacity...
Can't tell if I dc'd or got hit by morg q.
I want to know how much Brittle increases CC. From the trailer, it looks like maybe 25-33%.
But yeah, you are definitely right about the CC. I just checked, and the only champions in the game with none are Corki, Ezreal, Graves, Katarina, Lucian, Master Yi, Mordekaiser, Nidalee, and Sivir.
Brittle's extension has four restrictions, from what I can tell.
This means that brittle only extends the following types of CC.
The following types of CC are unaffected
The only CC I'm not really sure of is suspension, since it's an airborne effect that is reduced by tenacity.
I realize that there are still a ton of champions who use these types of CC, but realize brittle only increases CC durations by 30%. For each second of duration, gain 0.3 bonus seconds.
Champions with absurd synnergy are few and far between. That said, while you don't really need them (even with moderate synnergy, it's amazing), those few champions are absolutely terrifying.
Taking their entire kits into account, these are the worst offenders off the top of my head.
+1.05 seconds
+1.45 seconds
+0.75 seconds
+0.9 seconds
+0.9 seconds
+1.44 seconds
+1.2 seconds
This is a very powerful mechanic, and will likely be toned down before his release or shortly thereafter.
It is, however, worth noting that Ornn himself doesn't have a single disable that has its duration increased by this.
When Ornn gets released, Morgana's Q will be so long Leaverbuster will make me disconnect.
cross map ashe arrow + brittle
Why bother? He's got two knockups anyways.
hurr durr durr let's just continue to make tenacity less and less relevant
Probably not , you can't assume Ornn will be in 100% of games. If he won't and we buff tenacity then it will completely fuck other champs
I never understood why Riot keeps saying that most of the aspects of the game are unbalanceable, if they are releasing unbalaceable champs by themselves each 2-3 months 
Add Weighted Boots that reduce the duration of displacements.
oh sweet summer child.
We actually need +1 or 2 tenacity items with 10~15% tenacity stacking additively.
Because balancing the game around one champ works...
zac and leona with brittle xd
He's not going to be in 100% of games (and he may be too weak on release. We're looking at what amounts to a solo lane support). You'd be making tenacity too strong in games without him.
And it'll be a roughly 1 second increase on the longest stun in the game: Ashe's ult. Every other ability will gain less from that. And it's only immobilizing CC. Tenacity affects all CC but displacement, stasis, and suppression.
