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Unlike weapon skill, expertise is not limited to a particular type of weapon. Your character may switch from, say, an axe to a sword and still benefit fully from your expertise. The only exception to this is the racial bonus (e.g. humans' Sword Specialization) which only receives the +3 expertise bonus when a weapon of that class is equipped.
Like most other combat attributes, items do not directly increase your expertise. They rather increase your expertise rating, which is then used along with your level to calculate your actual expertise value (see combat rating). At level 80, every 8.2 points of expertise rating grants one point of expertise.
For level 83 (raid bosses) the soft cap(for dps) is 6.5% dodge or 26 expertise (214 expertise rating), and the hard cap(for tanks) is 14% parry or 56 expertise (460 expertise rating)
For level 82 and below (heroic bosses and trash mobs in raids) the dodge and parry caps are the same. You won't need more than about 22 expertise.
Expertise was introduced in Patch 2.3.0, replacing effects which increased weapon skill. With the patch, weapon skill bonuses for melee weapons were generally replaced with expertise rating bonuses. Talents and racial traits which increased weapon skill were changed to directly increase expertise (not expertise rating). Items and racials which previously granted ranged weapon skill were changed to grant hit or critical strike rating instead, as expertise has no effect on ranged attacks.
For more calculations and items see: Formulas:Expertise.
As of Patch 2.4 it actually is possible to become unparryable as a tank - with all the expertise items equipped it is possible to reach 369 expertise rating which means 109 expertise. It's much easier to do with the new if you are exalted with Shattered Sun Offensive, though only for 10 seconds.
- ↑ 3. Re: expertise rating help 02/26/2008 04:54:24 PM PST by Bornakk
- ↑ http://elitistjerks.com/f31/t29453-combat_ratings_level_80_a/
- ↑ http://www.tankspot.com/forums/f200/41907-frequently-asked-questions.html