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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%.

Contents 1 Expertise and Expertise Rating 2 Tanking 3 DPS 4 Expertise against Bosses 5 Expertise from Talents 6 Itemization 7 References 8 External links

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 3.92 expertise rating you equip, you gain 1 expertise at level 70.^{[citation needed]} 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 15.68 expertise rating at level 70 to reduce your chance to be dodged/parried by 1%.^{[citation needed]}

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)^[1], and can stack if multiple attacks are parried in rapid succession, leading to a potential source of massive burst damage.

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). However, it is possible to have enough expertise to prevent dodges, but not parries, and players with such 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 as high as 12-15% parry.^{[citation needed]} Assuming 6.5% dodge and 15% parry, a player would need 26 expertise (about 102 expertise rating - 101.92 exactly) to negate a boss' dodge chance, and 60 expertise (roughly 236 expertise 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 102 expertise rating, which is reasonably achievable given the gear added to the game in Patch 2.4. Tanks, however, attack from the front, and need to worry about both dodge and parry. As of Patch 2.4 it is actually possible to become unparryable as a tank with the new Shattered Sun Pendant of Resolve if you are exalted with Scryers, though only for 10 seconds.

Expertise from Talents

Warriors can gain 2/4/6 points of expertise from Defiance, in the third tier of the Protection tree.

Paladins can gain 1/2/3/4/5 points of expertise from Combat Expertise, in the sixth tier of the Protection tree.

Rogues can gain 5/10 points of expertise from Weapon Expertise, in the sixth tier of the Combat tree.

Itemization

Below is a partial list of rare and epic items seen in patch 2.3 that grant expertise rating.

Item	Amount	Slot	Type
[Edgemaster's Handguards]	17	Hand	Mail
[Earthwarden]	24	Two-handed	Mace
[Fang of Vashj]	21	One-handed	Dagger
[The Brutalizer]	21	One-handed	Axe
[Mallet of the Tides]	14	Main-hand	Mace
[Gauntlets of Enforcement]	21	Hand	Plate
[Bracers of the Ancient Phalanx]	22	Wrist	Plate
[Belt of One-Hundred Deaths]	25	Waist	Leather
[Gloves of the Searing Grip]	18	Hand	Leather
[Shoulderpads of the Stranger]	10	Shoulder	Leather
[Grips of Deftness]	15	Hand	Leather
[Brooch of Deftness]	21	Neck	Amulet
[Shapeshifter's Signet]	20	Finger	Ring
[Shard of Contempt]	44	Trinket	Trinket
[Demonblood Eviscerator]	17	Main-hand	Fist
[Firebrand Battleaxe]	14	One-handed	Axe
[Latro's Shifting Sword]	14	One-handed	Sword
[Terokk's Nightmace]	19	One-handed	Mace
[Timeslicer]	15	One-handed	Dagger
[Twinblade of Mastery]	11	One-handed	Dagger
[Whispering Blade of Slaying]	15	One-handed	Dagger

References

1. ^ Elitist Jerks-The Protection Warrior. Retrieved on 2008-04-08.

External links

v • d • e Attack table Spell Resist • Reflect • Spell critical strike • Spell hit • Spell penetration Melee Hit • Critical strike • Crushing blow • Glancing blow • Expertise Defense and damage mitigation Resilience • Resistance • Absorb • Deflect • Miss • Block • Dodge • Parry Related Immune • Evade