What happens if you have min. 100% reduction in control impairing effects? Are you then immune to frozen, jailer etc. or is there a cap? I play hardcore, so would be really cool to make a build with 100% reduction if it works.
I believe CC reduction is multiplicative, the same as cooldown reduction, and resource reduction. So let's say you have 2 items that both have 50% CC reduction, then you only end up with 75% total CC reduction.
You get stunned by an attack for 10 seconds. The first item's 50% CC reduction brings the stun down to 5 seconds. The second item you have equipped reduces the CC by 50% of the 5 seconds bringing it down to 2.5 seconds. So effectively you brought the stun down by 75%.