No Tenacity does not stack. Tenacity was put in as an alternative to players who couldn't afford to get mercury's treads.
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Tenacity isn't the same as CC reduction. Its not like 25 Tenacity = 25% CC reduction, there's some other math involved which I don't remember, but its less than that.
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I think there was a thread about this, not sure. I'm 90% sure that 35 Tenacity isn't 35% CC reduction though, I think Searz might know more about this.
Edit: Nvm, you're right.
Edit: Nvm, you're right.
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Pure tenacity is pure % in CC reduction. What I think you're talking about is Irelia passive combined with Tenacity items. THERE is some math involved so her max passive (40% cc) combined with Mercs is not 75% :P
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Yeah, I think that was what I was talking about.
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