Crits hurt. Your first gearing priority as a tank should be to become uncrittable. The formula: (83*5)+(5/0.04) = 540 Defense Skill. Remember that 540 is the crit cap as in, the cap for mitigating critical strikes. 540 is not a hard defense cap. Defense will still continue to increase your dodge, parry, and block by 0.04%.
The explanation: The chance to land a critical strike is modified by the difference between the attacker's Weapon Skill and the defender's Defense Skill. All mobs have a Weapon Skill of Level*5. So a level 83 boss will have a weapon skill of 83 * 5 = 415 Defense Skill.
All mobs also have a base 5% chance to land a critical strike. Recall that every point in Defense Skill increases your critical strike mitigation by 0.04%. So in order to negate the 5% crit chance you will need 5 / 0.04 = 125 Defense Skill.
By the power of math, 415 + 125 = 540. You need 540 Defense Skill in order to be uncrittable at level 80.

Comments (11)
I have a ring from SSC that gives me 37 resilience rating. If I understand the resilience mechanic correctly, then i should get something along the lines of .98 *effective* defense per point of resil.Â
 Using that logic, would it be correct to assume that I'd need 540-36.26=503.74 (rounded to 504) Defense Skill?
 Your thoughts would be appreciated.
-Psycaeda (Destromath-US)
- At level 80 it takes 82 resilience rating per 1% resilience.
- At level 80: 4.92 Defense rating per 1 point defense skill
 Thing ring has 37 Resilience on it. At level 80 37 Resilience:- = 0.45% Crit reduction
- = 55.35 equivalent Defense Rating
- = 11.25 Defense Skill
So if my WoW math is correct: 540 - 11.25 = 528.75 Defense SkillThis argument is pointless btw
Prior to the expansion, blizzard changed the resilance mechanic so that it no longer functions in pve instances
Defense is the only was to become uncritable unless your a druid and can do it through talents
It's not an argument, someone asked a question so I answered. I can't find any information on that PvE resilience change in any of the recent live realm patch notes; It was probably something discussed in beta. Do you have a link or a blue quote?
Regardless, Don't stack resilience...defense is far better for PvE tanking if you have or can obtain better items.
Resilence sucks because it adds no avoidance. However, it still can be used to achieve 6.0 total reduced crit chance.
Also the above article is wrong to assume that level 80 raid bosses are level 83. They are, in fact, level 82. Thus, uncrushability was made useless since their level is no longer red to you.
Raid bosses are level 83 (heroic bosses are 82). As of 3.0, Crushing Blows only occur to mobs four levels higher than you (thus making uncrushability irrelevant in the high level content).
nerds
Also the above article is wrong to assume that level 80 raid bosses are level 83. They are, in fact, level 82. Thus, uncrushability was made useless since their level is no longer red to you.
boediger
They changed the Crushing Blow mechanics so that mobs need to be four levels instead of the traditional 3.
Heroic 5-man bosses are level 82, raid bosses are player cap +3. This has always been and still is the case. Seriously, go poke the heroic training dummies in any major city or inspect WWS logs from a raid; melee formulas still calculate out for a level 83 mob.
Resilience can be used to reach/help reach uncrittable, although Defense Rating is much better as it also adds avoidance, is easier to calculate, and doesn't make you look like a n00b when you stack it to tank.
Raid bosses are still considered level 83 for all mechanical purposes, therefore yellow melee hit cap for a dps is still 8% (reduced from 9%), and Defense skill cap for a tank is 540.
Heroic bosses are level 82, so slightly lower stats are needed to achieve the same results, but it is generally considered wise to keep yourself raid-worthy (less gear-swapping and gemming/enchanting for optimal itemization for two different encounters.)
Hope this information cleared some things up.
I'm not sure about resilience increasing defense rating at least against mobs anyway.
U R probly right but it certainly does not directly effect crits and dmg from mobs.If u mouse over the skill in your char sheet its says this.
However it is ABSOULUTLY ESSENTAIL for arena matches and very very useful for bg's.
If it increases the defence rating against mobs as well then ace coz when my mail arrives I'll be getting an additional 200resilience :D
Also I heard (though cannot back this up) that defense rating has a simmilar lack of effect against players though I am unsre of the validity of the source of this info(bit of a bloke down the pub one that). can anyone confirm or disprove this for me :D
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