Expertise rating
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Introduced in patch 2.3 to replace Weapon Skill, each point of expertise will reduce the chance that a mob will dodge or parry your melee attacks by 0.25%.[citation needed]
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Expertise and Expertise Rating
Note that there is a difference between "expertise" and "expertise rating". Expertise rating is typically gained from item bonuses, and for each 8.1974973675 expertise rating you equip, you gain 1 expertise at level 80.[1] Expertise is typically gained from talents, and for each 1 point of expertise you reduce your chance to be dodged/parried by 0.25%. Thus it takes exactly 32.78998947 expertise rating at level 80 to reduce your chance to be dodged/parried by 1%.[2]
| Expertise Rating Required Per 1% Dodge/Parry | |||||||
|---|---|---|---|---|---|---|---|
| Level 60 | Level 70 | Level 80 | |||||
| 10 | 15.76923275 | 32.78998947 | |||||
Tanking
Expertise is of two-fold use to tanks. First, by reducing the target's avoidance, it improves a tank's threat generation (more of his attacks will land). More importantly, because mobs may attack more quickly after parrying an attack, expertise reduces the total damage that the tank may receive by reducing the chance that his target parries. The increase in attack speed varies (from 0-40% of the speed of the parried attack)[3], and can stack if multiple attacks are parried in rapid succession, leading to a potential source of massive burst damage.
Of all four tanking classes, paladins need expertise the least, because for them only auto-attack is affected by it. For accuracy, paladins should rather invest in hit rating gear and enchants because it affects spells as well as melee attacks.
DPS
Melee DPS also benefit from expertise. With sufficient expertise, melee classes can attack their target from the front without being dodged or parried (although facing restrictions, such as those on Backstab or Shred, still apply). It is possible to have enough expertise to prevent dodges and parries, but parries are much harder to prevent, and players without such high expertise values should remain behind the target to prevent parried attacks from increasing the target's attack speed against the tank.
Expertise against Bosses
The dodge and parry chances for boss-mobs is currently disputed, but combat parses tend to point at around 6.5% dodge and 14% parry.[4] Assuming 6.5% dodge and 14% parry, a player would need 26 expertise (214 expertise rating) to negate a boss' dodge chance, and 56 expertise (460 rating) to prevent parries.
To "cap" expertise against a raid boss, melee DPS need only concern themselves with the boss' dodge chance, provided that they attack from behind. This dictates a goal of 214 expertise rating. Tanks, however, attack from the front, and need to worry about both dodge and parry.
Arms warriors who put the full 2 points into the Weapon Mastery talent have 2% less chance to be dodged, which means they need 18 expertise to be capped (148 expertise rating at 80, or 115 with full Strength of Arms).
Expertise from Talents
Warriors can gain 2/4/6 points of expertise from Vitality (Warrior talent), in the eighth tier of the Protection tree. They can also gain 2/4 points of expertise from Strength of Arms, in the seventh tier of the Arms tree
Paladins can gain 2/4/6 points of expertise from Combat Expertise, in the eighth tier of the Protection tree.
Rogues can gain 5/10 points of expertise from Weapon Expertise, in the sixth tier of the Combat tree.
Druids can gain 5/10 points of expertise from Primal Precision, in the fourth tier of the Feral tree.
Death Knights can gain 1/2/3/4/5 points of expertise from Tundra Stalker and Rage of Rivendare. These talents are located in the tenth tiers of the Frost tree and Unholy tree, respectively. Veteran of the Third War also gives 2/4/6 points of expertise, and is located in the fifth tier of the Blood tree.
Shamans can gain 3/6/9 points of expertise from Unleashed Rage, in the sixth tier of the Enhancement tree.
Expertise from Racial Traits
Humans gain 3 expertise from their Sword and Mace Specialization trait when using a sword or a mace.
Dwarves gain 5 expertise from their Mace Specialization trait when using a mace.
Orcs gain 5 expertise from their Axe Specialization trait when using an axe.
Other
Tanking paladins can gain 10 points of expertise with Glyph of Seal of Vengeance.
References
- ^ http://elitistjerks.com/f31/t29453-combat_ratings_level_80_a/
- ^ http://elitistjerks.com/f31/t29453-combat_ratings_level_80_a/
- ^ Elitist Jerks-The Protection Warrior. Retrieved on 2008-04-08.
- ^ http://elitistjerks.com/f31/t37032-faq_working_theories_raiding_level_80_a/
External links
elitistjerks.com Roguecraft 101- Hit and Expertise article on Random Ravings.
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