Does this grant immunity to status effects such as stun, charm, freeze, fear etc? Also, is this achievable?
I did it once with my monk for the fun of it, and sold the equipment later on.
What happens? The frozen/jailed animation kicks in for a moment, and you are free a millisecond after that. Although, this was pre 1.03 patch. I don't know if they changed this behaviour afterwards.
Note: This is mainly to point out post-1.0.3 changes which bora didn't cover in his post; I haven't done any testing on 100% CC reduction - hopefully bora or someone else gives us more details.
From the patch 1.0.3 notes:
Crowd Control Reduction from items and skills will now reduce the percentage value of Slow, Chill, and Attack Speed debuffs rather than reducing how long the debuff lasts
For example: previously, if you were debuffed by a 60% slow that lasted for 2 seconds while wearing gear that provides 20% Crowd Control Reduction, your movement speed would be reduced by 60%, but only for 1.6 seconds. Now, the same amount of Crowd Control Reduction will reduce the Slow effect to 48%, but the effect will remain for the full 2 second duration.
As they specifically mention chilled, I imagine it works as described for Frozen - no idea if Jailed also means you get to drag along the jail at half speed, if you have 50% reduction.
well, just tried building "max gear" for CC-redux In short: You are not able to get 100%.
When you have the cap (108% from gear) it stacks like so: Helm= 14% redux, multiplier = .86 Neck= 14% redux, multiplier = .86 Ring (left) = 14% redux, multiplier = .86 Ring (right) = 14% redux, multiplier = .86 Wrist = 4% redux, multiplier = .96 etc. it ends up to be following calculation: 1-(.86*.86*.86*.86*.96* ... ) = reduction by 68.56 (rounded - the Details window in game shows 68.55)
Anyway, since no single item has 100% reduction, you can't get 100% reduction.
So to answer your question, here's what I think would happen - game would crash :)