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A critical strike deals extra damage during an attack. This could represent an attack that hits harder, a lucky strike or damaging a weak area on an opponent.
Most champions have different attack animations for critical strike.
Players can increase the chance and the damage of critical strikes with items, abilities, and runes.
It only applies to basic attacks or certain spells like 普朗克的 Parrrley that act like a basic attack or 盖伦的 Judgment, which is something unique.
Critical strike is valuable for all champions who primarily deal damage with automatic attacks, rather than through abilities. Some champions, such as Ashe, have an affinity for critical hits and benefit more from items that improve them.
It's important to note that you cannot score a critical strike against a building such as a tower or inhibitor.
Chance编辑
Critical strike chance is the chance of a champion's basic attack dealing a critical strike. Critical strike chance stacks additively. Runes, items and abilities can increase critical strike chance.
The maximum critical strike chance you can reach at level 1 without items is 20.25%, excluding Ashe's and Tryndamere's passive.
Critical strike chance has a hard cap at 100%, at which point all of your basic attacks will be critical strikes.
Increasing critical strike chance编辑
Items编辑
 +18% critical strike chance, +45 armor. Unique passive: You gain attack damage equal to 1.5% of your maximum health. 2355 gold :
 +12% critical strike chance. Unique passive: Gain +5 gold per 10 seconds. 750 gold :
 +8% critical strike chance. 400 gold :
 +20% critical strike chance, +20% attack speed, +35 tenacity. 1450 gold :
 +18% critical strike chance. 830 gold :
 On use, grants 8% critical strike chance and +12–22% attack speed (based on champion level) for 4 minutes. 250 gold :
 +15% critical strike chance, +18% life steal. Unique passive: On hit, target suffers 4 magic damage per second for 8 seconds (maximum 1 stack). Unique active: Target enemy champion suffers −50% healing effectiveness for 8 seconds. 20 second cooldown. 1350 gold :
 +25% critical strike chance, +80 attack damage. Unique passive: +50% critical strike damage. 3830 gold :
 +30% critical strike chance, +55% attack speed, +12% movement speed. 2845 gold :
 +15% critical strike chance, +30 ability power, +30 attack damage, +30% attack speed, +250 health, +250 mana, +12% movement speed. Unique passive: On hit, 25% chance for target to be slowed by 35% (+25% for ranged attacks) for 2.5 seconds. Unique passive: On cast, for 10 seconds, your next standard attack deals extra damage equal to 150% of your base attack damage. Cooldown 2 seconds. 4070 gold :
 +18% critical strike change, +20 attack daamge. Unique Passive: Your basic attacks inflict Grievous Wounds on enemy champions, causing 50% reduced healing and regeneration for 1.5 seconds. 1955 gold :
 +15% critical strike chance, +30 attack damage. Unique passive: +20 armor penetration, +15% cooldown reduction. Unique active: Gain +50% attack speed and +20% movement speed for 4 seconds. Attacking enemies with melee attacks increases the duration by 2 seconds to a maximum of 8 seconds. 60 second cooldown. 2687 gold :
 +10% critical strike chance, +20% attack speed, +6% movement speed. 1195 gold :
Champion abilities编辑
 艾希的 Focus increases her critical strike chance by 3%  18% (based on level) every 3 seconds while out of combat, removed after the next attack.
 潘森的 Heartseeker Strike grants him 100% critical strike chance against targets below 15% of their maximum health.
 萨科的 Deceive grants him 100% critical strike chance on his next attack, but for modified critical damage: 40% / 60% / 80% / 100% / 120%. Bonus critical damage from , Lethality Lethality and runes will still apply.
 泰达米尔的Battle Fury Battle Fury passively increases his critical strike chance by 0.35% per point of Fury he currently has.
Runes编辑
 Malice runes increase critical strike chance.
Damage编辑
Critical strike damage affects the amount of bonus damage that a champion's critical strike deals. All champions begin with +100% bonus damage on a critical strike, thus doing 200% damage. This statistic stacks additively.
Critical strike damage applies only to a champion's physical damage portion of an autoattack. Critical strike damage will not affect any onhit damage, including physical damage from effects such as and Siphoning Strike Siphoning Strike). However, all forms of additional damage will stack with critical strike damage (unless critical strike is disabled for the modified attack, see onhit effects).
The maximum critical strike damage bonus obtainable with runes, (45.51%), and masteries, (10%), is 55.51%. The only item that adds Critical Strike damage is the attack damage.
. The maximum damage dealt by a Critical Strike is found by adding up all these sources, 200% + 55.51% + 50% is 305.51% of the champion'sIncreasing critical strike damage编辑
Items编辑
 Unique Passive: +50% critical strike damage. +80 attack damage, +25% critical strike chance. 3830 gold :
Masteries编辑
Runes编辑
 Furor runes increase critical strike damage.
Skills affected by Critical Chance编辑
Certain skills are capable of Critical Strikes and/or are affected by Critical Chance, however these skills may bound to certain limitations. E.g. 波比的Devastating Blow Devastating Blow will gain critical damage bonus only based on her attack damage, and the bonus damage part of the skill is not accounted.
Below is the list of skills that are capable and affected by critical strikes and chances.
 德莱厄斯的 Crippling Strike: The entire damage including its bonus damage component can critically strike.
 德莱文的 Wicked Blades, is procced by critical strikes
 普朗克的 Parrrley: The entire damage including its bonus damage component can critically strike.
 盖伦的 Judgment: Only bonus damage aside from base damage can critically strike.
 盖伦的 Decisive Strike: Only bonus damage aside from base damage can critically strike.
 诺提勒斯的 Staggering Blow: The entire damage including its bonus damage component can critically strike.
 波比的Devastating Blow Devastating Blow: Only base attack damage component gain critical damage bonus and applied as magic damage.
 萨科的 Backstab: Damage bonus increases damage after critical modifier.
 希维尔的 Ricochet: The entire damage including its bonus damage component can critically strike.
 希瓦娜的 Twin Bite: Only applicable to first hit.
 泰隆的 Mercy: Damage bonus increases damage after critical modifier.
 雷恩加尔的 Savagery: The entire damage including its bonus damage component can critically strike.
Miscellaneous编辑
Other skills that may OR may not be affected by critical strikes and chances, due to other reasons.
 奈德丽的 Takedown: There is a known bug for the skill to critically strikes, yet receive no critical damage. This may be due to it switches the entire damage into "bonus damage", and the skill itself allows critical strike to base on the attack damage portion only, which may lead to the current result of "Critically strikes without inflicting Critical bonus damage.
 潘森的 Spear Shot: Only affected by critical condition based on his Certain Death, and critical bonus only affected by it's own modifier of 150% of skill's damage, instead of regular modifier. does not change this modifier, nor critical chance from any item affects it.
 萨科的 Deceive: Causes next autoattack during the next 6 seconds to deal increased damage, which is described as a "Critical Strike", and is affected by any other modifier such as .
 赵信的 Three Talon Strike: Critical damage increment does not affect the resulting damage during all 3 hits. This may be due to all 3 hits are counted as purely "bonus damage portion". This would be assuming that only base damage is accounted to critical damage bonus, whereby since the "base damage" of this skill is "0", thus resulting damage is not affected by critical damage bonus.
Champion statistics  

Offensive  
Defensive  
Magical 