Combat rating system

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Combat rating is a mechanic introduced in patch 2.0.1 which are for combat stats on items that were previously percentage based. Rating is converted linearly to percentage; the number of rating points needed to gain one percentage point increases with level and varies depending on the stat, but is the same for all classes. Ratings were introduced because percentage based itemization would have scaled excessively when The Burning Crusade was released and the level cap rose to 70.

Combat rating types

The following combat ratings are currently in use:

Unlike fixed percentages such as 2% critical strike chance, combat ratings diminish in potency as characters increase in level. 2% crit is the same at every level, while 28 critical strike rating grants 4% crit at level 34, 2% crit at level 60, and 1.27% crit at level 70. This allows Blizzard the ability to create and add new and better items to the world without eventually reaching a point where every character has a 100% chance to critically strike.

All classes convert ratings into attributes at the same ratio. Below are the conversions for combat ratings at each expansion's level cap: [1]

Combat Ratings

Rating Effect Level 60 Level 70 Level 80 Level 85 Level 90 Level 100 Level 110
Critical strike 1% critical strike chance[nb 1] 14 15.86 17.72 19.89 23.0 110.0 400
Haste 1% haste[nb 2] 10 14.04 15.69 17.61 20.0 90.0 375
Mastery 1 Mastery point 14 15.86 17.72 19.89 23.0 110.0 400
Versatility 1% Damage/Healing and 0.5% Incoming Damage Reduction 16.54 18.74 20.94 23.51 27.0 130.0 475

Tertiary Ratings

Added in Patch 6.0.2, these bonus stats have a slight chance to appear on gear from the Warlords of Draenor and Legion expansions.

Rating Effect Level 90 Level 100 Level 110
Avoidance -1% Damage from Area of Effect attacks 7.19 34.38 110
Leech 1% of Damage and Healing returned as Healing 14.51 70 230
Speed 1% Increased Movement Speed 5.23 25 80

Removed Secondary Stats

Removed from game The subject of this section has been removed from World of Warcraft.

The following combat ratings are either no longer itemized on gear or have been removed from game. This chart is purely for historical purposes. Note that ratings that do appear on legacy gear (ex. Dodge) still maintain their functionality.

Rating Effect Level 60 Level 70 Level 80 Level 85 Level 90 Level 90 Squished Level 100
Armor Penetration 1% Armor Ignored 3.75 5.92 12.31 - - - -
Defense Rating +1 Defense Skill 1.5 2.37 4.92 - - - -
Dodge 1% dodge chance 13.8 21.7615 45.202 176.71899 885.0 - -
Parry 1% parry chance 13.8 21.7615 45.202 176.71899 885.0 - -
Block 1% block chance 6.9 10.8808 22.6251 88.3594 295.0 - -
Physical hit 1% hit chance[nb 3] 9.37931 14.7905 40.7548 102.446 340.0 - -
Spell hit 1% spell hit chance[nb 3] 8 12.6154 26.232 102.446 340.0 - -
Expertise -1% Dodge/Parry and 1% Spell Hit 2.34483 3.69761 7.68869 102.446 340.0 - -
PvP Resilience -1% Damage from Players 9.292 14.652 30.467 92.316 310.0 12.0 56.0
PvP Power 1% Damage/Healing to Players 7.964 12.559 26.115 79.128 265.0 10.0 49.0
Multistrike 2 chances to do an extra 30% damage N/A N/A N/A N/A N/A 14.0 66.0
Weapon Skill +1 Weapon Skill (to specific weapon type) 2.5 3.9 - - - - -

Notes:

  1. ^ Physical critical strike chance and spell critical strike chance were distinct attributes derived from the same critical strike rating (now equal).
  2. ^ Haste effects attack speed, casting speed and non-mana resource (e.g. energy, runes) regeneration.
  3. ^ a b Physical hit chance and spell hit chance were distinct attributes derived from the same hit rating (now retired).

Diminishing returns (no longer relevant)

Avoidance stats suffer from diminishing returns ("DR"), meaning the rate of return for each point contributed from gear is not constant. The in-game tooltips will show the undiminished value, but the amount actually received is lower. Base stats and talents are not affected by DR, but stats from gear are diminished.

The formula to calculate the diminished part of a stat is as follows:

1    1   k
—  = — + —
x'   c   x

where:

x' is the avoidance after DR.
x is the avoidance before DR.
c is a class-specific cap of the stat.
k is also a class-specific constant.

The table containing the class-specific caps for parry (Cp) and dodge (Cd) is as follows:[2]

k Cp 1/Cp Cd 1/Cd
Death knight 0.9560 65.631440 0.01523660 65.631440 0.01523660
Druid 0.9720 N/A N/A 116.890707 0.008555
Paladin 0.9560 65.631440 0.01523660 65.631440 0.01523660
Warrior 0.9560 65.631440 0.01523660 65.631440 0.01523660
Hunter 0.9880 145.560408 0.006870 145.560408 0.006870
Mage 0.9830 N/A N/A 150.375940 0.006650
Priest 0.9830 N/A N/A 150.375940 0.006650
Rogue 0.9880 145.560408 0.006870 145.560408 0.006870
Shaman 0.9880 145.560408 0.006870 145.560408 0.006870
Warlock 0.9830 N/A N/A 150.375940 0.006650

See also

Patch changes

  • Legion Patch 7.3.0 (2017-08-29): The Avoidance stat has been reduced in effectiveness by 27% at all levels.
  • Legion Patch 7.1.5 (2017-01-10): To allow more options in the gear your character equips, secondary stat ratings (Critical Strike, Haste, Mastery, and Versatility) now contribute less of their respective secondary stat per point.
This only affects ratings at Level 110.
  • Legion Patch 7.0.3 (2016-07-19): Multistrike removed.
  • Warlords of Draenor Patch 6.1.0 (2015-02-24): Tertiary Stats for Avoidance, Speed, and Leech now provide about four times as much benefit per stat point.
  • Warlords of Draenor Patch 6.0.2 (2014-10-14): Many ratings were removed from the game, including all tank avoidance ratings and hit/expertise. Gear with any of these stats has had them replaced by bonus armor, crit, haste, or mastery. Two new secondary stats were added, multistrike and versatility, which generally only exist on items found in Draenor and later (level 90+ content). PvP ratings are no longer found on any new gear, but old gear still has these stats present. Teritary stats added.
  • Cataclysm Patch 4.0.1 (2010-10-12): Mastery rating has been added as a new stat which provides unique benefits for characters based on class and talent specialization. Mastery rating does not currently exist on items in the game, however, Reforging can be used to add Mastery rating as a secondary stat to existing items.
The following stats have been removed from gear: attack power, spell power (with the exception of caster weapons), MP5, armor penetration, block value, defense (and defense rating), weapon skills.
  • Wrath of the Lich King Patch 3.2.0 (2009-08-04):
    • Agility: The amount of agility required per percentage of Dodge has been increased by 15%. This change required recalibrating the amount of dodge a player has with 0 agility by a slight amount as well, so all players will see their dodge percentage vary a small amount.
    • Block rating: The amount of bonus block value on all items has been doubled. This does not affect the base block value on shields or block value derived from strength.
    • Dodge Rating: The amount of dodge rating required per percentage of dodge has been increased by 15%. This is before diminishing returns. Combined with other changes, this makes dodge rating and Parry rating equally potent before diminishing returns apply.
    • Parry Rating: The amount of parry rating required per percentage of parry has been reduced by 8%. This is before diminishing returns. Combined with other changes, this makes dodge rating and parry rating equally potent before diminishing returns apply. Parry still diminishes more quickly than dodge.
    • Resilience: No longer reduces the amount of damage done by damage-over-time spells, but instead reduces the amount of all damage done by players by the same proportion. In addition, the amount of resilience needed to reduce critical strike chance, critical strike damage and overall damage has been increased by 15%.
  • Wrath of the Lich King Patch 3.1.0 (2009-04-14):
    • Armor Penetration Rating: All classes now receive 25% more benefit from Armor Penetration Rating.
    • Haste Rating: shamans, paladins, druids, and death knights now receive 30% more melee haste from Haste Rating.
  • Wrath of the Lich King Patch 3.0.2 (2008-10-14):
    • Hit Rating, Critical Strike Rating, and Haste Rating now modify both melee attacks and spells.
    • All items and effects which grant bonuses to spell damage and spell healing are being consolidated into a single stat, Spell Power. This stat will appear with the same values found on items which grant "increased spell damage and healing" such as on typical Mage and Warlock itemization.
  • The Burning Crusade Patch 2.3.0 (2007-11-13):
    • All items have had their bonuses to Weapon Skill Rating converted to a new stat called Weapon Expertise Rating. Each point of Weapon Expertise reduces the chance for your attacks to be Dodged or parried by .25%.
    • Healing: Almost all items and enchantments that provide bonus healing now also provide a smaller number (approximately 1/3) of bonus spell damage. There are a few items and enchantments where this was not possible, such as random-stat items and Zul'Gurub enchantments, but this is now the case on virtually all other items.
    • Weapon Skill: All items and abilities that granted weapon skill have been changed. In most cases, they were converted to expertise or expertise rating. Ranged attacks do not benefit from expertise, so ranged weapon skill has generally been replaced by critical strike bonuses or hit bonuses. In a few cases, talents have been changed to other effects to avoid granting players excessive amounts of expertise.
  • The Burning Crusade Patch 2.2.0 (2007-09-25):
    • Resilience rating: The reduction to the percent chance to get a critical strike now also reduces the damage dealt by damage over time effects by the same percentage.
  • The Burning Crusade Patch 2.1.0 (2007-05-22):
    • Spell Haste: The amount of spell haste rating needed per percentage of haste has been increased substantially. However, spell haste will now affect channeled spells, increasing the rate of their effects and decreasing their total duration. The same amount of damage/healing per casting will occur, but will take less time.
    • The amount of parry rating needed to get 1% parry has been reduced by 25%.
    • Dodge Rating: Low level players now calculate dodge from dodge rating at the same rate as level 34 players.
  • The Burning Crusade Patch 2.0.1 (2006-12-05):
    • New item property "Resilience" has been introduced. Resilience reduces your chance to be the victim of a critical strike, and reduces the amount of damage critical strikes do to you.
    • Weapon Skill now does the following:
      • Weapon skill will no longer reduce the percentage damage lost due to glancing.
      • The player will gain 0.1% to their critical strike rating per weapon skill against monsters above their level.
    • Items that give bonuses, such as critical strike percentage, have been modified to adhere to a combat rating system.
    • All current items will provide the exact same benefit from ratings at level 60 as they provided before the ratings system.

References

  1. ^ SimulationCraft 2017-04-11. SimulationCraft Scaling Data.
  2. ^ Whitehoof 2010-10-24. Combat Ratings at level 85 (Cataclysm).