Expertise
Expertise (also known as Exp and Ept) was a secondary attribute introduced in Patch 2.3.0. Each percent of expertise decreased the chance that melee or ranged attacks made by the player will be dodged by the same percentage. If the dodge chance was completely negated by expertise, any leftover expertise would then negate parried by the same amount. With Patch 5.0.4, Expertise also increased Spell hit for casters by the same amount.
For example, a special attack against a boss level target would have 7.5% to be dodged and 7.5% chance to be parried (from the front only).
6.5% expertise would reduce the dodge chance by 6.5% (to 1%), would not affect the parry chance and will add 6.5% to spell hit.
7.5% expertise would eliminate the dodge chance completely, would not affect the parry chance and will add 7.5% to spell hit.
8.5% expertise would eliminate the dodge chance completely, would reduce the parry chance by 1% (to 6.5%) and will add 8.5% to spell hit.
Expertise was removed with Patch 6.0.2 along with hit rating. The developers described the process of reaching the expertise and hit caps as a penalty rather than an augmentation, with players inevitably regarding the stats as mandatory rather than "fun". As a result, the stats were removed, with players effectively automatically capped in both expertise and hit.
Expertise rating
Note that there is a difference between "expertise" and "expertise rating". Expertise is the attribute itself; expertise rating is a rating which is converted into expertise at a ratio determined by your level. For example, a level 90 character will gain 1% expertise for every 340 expertise rating. Expertise rating is the main source for expertise, typically gained from gear and enhancements such as gems and enchantments.
| Level 60 |
Level 70 |
Level 80 |
Level 85 |
Level 90 |
| 9.3793201447 |
14.7904396057 |
30.7547607422 |
120.1088 |
340 |
Expertise caps
For boss-level mobs (which are calculated as level + 3) the soft cap is 7.5% dodge or 7.5% expertise (2550 expertise rating), and the hard cap is an additional 7.5% parry or 15% expertise (5100 expertise rating at level 90). Melee DPS classes will usually focus on the soft cap, since bosses cannot parry when attacked from behind. Some tanks will like to collect a lot of expertise in order to avoid boss parries, which may result in the Parry-Hasting effect. However, recently the boss Parry-Hasting effect has been disabled on some of the bosses.[1]
For level 87 and below (heroic bosses and trash mobs in raids) the dodge and parry caps are the same.
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