I'm gonna be honest... I read this first thinking that you thought that 540 defense guarenteed you to be crit immune from bosses (which in almost every case is true) however after re-reading the second paragraph (and running out of breadcrumbs) I have no idea what you are talking about.
Originally Posted by Insahnity
Here is what my response was going to be based off of the first assumption:
Here's the thing, it is crit immunity because bosses have a flat rate chance of 5% to crit you, so if you reduce the chance a boss has to crit you by 5%, you are technically "crit immune" however, if his crit chance goes up (aka: chance to cause next attack to be a crit!) then the boss all of the sudden has 100% chance to crit on his next hit (so 100% - dodge/block/miss/parry/noncrit) which means he will have a chance to crit and you get crit, even with over 545 defense.
Also: you cannot get 100% crit immune from resilience, it caps out iirc, however the cap is more than it is possible to stack resil for I believe, but it's been a long time since I've looked at the numbers since the last time it was possible was in TBC and as a warrior in PvP I really don't worry about resil that much these days.
It also actually takes a very small amount of resilience to get 5% crit reduction, I think it is less than 300.
Oh and another note, only 100% resil chance to not crit will save you is innacurate. Any attack that is blocked cannot be a crit, therefore an unhittable set can push crits off the table even if the boss has a 100% chance.
"If the world is something you accept rather than interpret, then you're susceptible to the influence of charismatic idiots." -Neil deGrasee Tyson
Twitter @Aggathon || @Tankspot || Twitch.Tv/Aggathon