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{{Disambiguation|Magic Critical Hit}}
==Overview==
Every time players swing at a monster, they have a chance to critical hit. If they successfully critical, the monster will take additional damage. This boost to damage is represented in two phases, an increase in [[pDIF]], or effective [[Attack]], and direct modification by [[Critical Attack Bonus]] and other similar abilities. Additionally, Critical Hits forced by [[Sneak Attack]] and [[Trick Attack]] with [[Thief]] main receive [[base damage]] bonuses from [[Dexterity]] and [[Agility]] respectively.

While all normal swings have the potential to critical, [[Weapon Skill]]s can only critical hit if their descriptions read "chance to critical hit varies with TP." or an effects enables them to critical hit (ex. [[Shining One]]). This has been proven multiple times, though the easiest verification method is using 1-hit weapon skills and looking for damage that indicates a critical hit has occurred. It also appears that some weapon skills, though they possess the appropriate description, do not receive the benefit of base and gear Critical Hit Rate, like [[Blade: Rin]].

*For '''melee weapons''', critical hit rate is the sum of the base rate (5%), gear/atma (0-100%), merit points (0-5%), Buffs, [[Weapon Skill]] modifiers, and player [[Dexterity]] relative to target [[Agility]] (also known as dDEX, 0-15%). As there is no cap to critical hit rate, it can be taken all the way to 100%, guaranteeing that every attack is a critical hit. Category-specific caps are marked. It also only takes whole number values, so it is impossible to have something like a 12.5% Critical Hit Rate.
**[[Weapon Skill]]s with the description "Chance of Critical Hit varies with [[TP]]" modify Critical Hit Rate during Weapon Skill. Generally, the base modification at 1000[[TP]] varies from 0% to 40%, and extra Critical Hit Rate is awarded for TP over 1000.
***'''Example:''' A [[Thief]] has 115 [[Dexterity]], Level 5 Critical Hit Rate Merits, +4% Critical Hit Rate in gear, and is fighting a monster with 96 [[Agility]]. They have a 5% + 4% + 5% + 0% + 2% (dDEX=19) = 16% Critical Hit Rate.
*For '''ranged weapons''', critical hit rate is the sum of the base rate (5%), gear/atma (0-100%), merit points (0-5%), Buffs, [[Weapon Skill]] modifiers, and player [[Agility]] relative to target [[Agility]] (also known as dAGI, no known cap).
**Dexterity does '''not''' affect critical hit rate for ranged weapons.

===Melee Critical Hit Rate (dDEX)===
----
dDEX (Player [[DEX]] - Target [[AGI]]) determines the contribution of [[Dexterity]] to melee critical hit rate. This is added on to the base rate and merits to determine the total critical hit rate. Because this value depends on the target's [[Agility]], which will be determined by its level and job combination, Critical Hit value changes significantly depending on target.

Based on the chart below, you can see that there is an extremely significant jump in critical hit rate when dDEX is increased from 40 to 50 (from 4% at dDEX=39 to 15% at dDEX=50), but no further boost to critical hit rate once dDEX is greater than 50.
{|
|
{| border="1" cellpadding="0" cellspacing="0" BGCOLOR="#cee0f2" width="200px"
|BGCOLOR="#cee0f2" width="50%" colspan="1" align="center"|'''dDEX'''
|BGCOLOR="#cee0f2" width="50%" colspan="1" align="center"|'''Crit Rate'''
|-
|BGCOLOR="#cee0f2" width="50%" align="center" colspan="1" valign="top"| '''0-6'''
|BGCOLOR="#ffffff" width="50%" align="left"| +0%
|-
|BGCOLOR="#cee0f2" width="50%" align="center" colspan="1" valign="top"| '''7-13'''
|BGCOLOR="#ffffff" width="50%" align="left"| +1%
|-
|BGCOLOR="#cee0f2" width="50%" align="center" colspan="1" valign="top"| '''14-19'''
|BGCOLOR="#ffffff" width="50%" align="left"| +2%
|-
|BGCOLOR="#cee0f2" width="50%" align="center" colspan="1" valign="top"| '''20-29'''
|BGCOLOR="#ffffff" width="50%" align="left"| +3%
|-
|BGCOLOR="#cee0f2" width="50%" align="center" colspan="1" valign="top"| '''30-39'''
|BGCOLOR="#ffffff" width="50%" align="left"| +4%
|-
|BGCOLOR="#cee0f2" width="50%" align="center" colspan="1" valign="top"| '''40-50'''
|BGCOLOR="#ffffff" width="50%" align="left"| +(dDEX-35)%
|-
|}
| width="2px" |
|valign="top"|

===Ranged Critical Hit Rate (dAGI)===
----
[[dAGI]] (Player [[AGI]] - Target [[AGI]]) determines the contribution of [[Agility]] to ranged critical hit rate. This is added to the base rate and merits to determine the total critical hit rate. This value does depend on the target's agility, but there are few times when critical hit rate builds are optimal (vs. times when they're less optimal) because adding the same amount of AGI always grants the same amount of critical hit rate and ranged critical hits are a constant multiplier of the damage you would have done otherwise.

: Crit Rate = +[[floor]]( '''dAGI'''{{math|divide}}10 )%

This has been tested for the ranges of dAGI = 0~90.
|}
{| width="100% align="center"
|valign="top"|

==Merit Points==
{{Job Trait
|desc=Increases your Critical Hit Rate by 1% per merit level.
|type=[[Merit]]
|job=Any
|level=
|value=
|mtier=1
|ranks=5
|effect=Grants an additional 1% increase to your Critical Hit Rate.
|notes=*It costs 15 merits to fully upgrade (1>2>3>4>5).
*This is generally the most popular merit choice in the "other" category.
}}
|width="10%"|
|valign="top"|
== Job Points ==
{{Job Trait
|desc=Increases your Critical Hit Rate.
|type=[[Job Point]]
|job=Any
|Insert Job Trait Level Template=
{{Job Trait Level
|tier=I
|jlevels=[[WAR]] 99 <big>(100[[Job Points#Warrior|JP Gift]])</big>
|value=5%
}}
{{Job Trait Level
|tier=II
|jlevels=[[WAR]] 99 <big>(1200[[Job Points#Warrior|JP Gift]])</big>
|value=10%
}}
|notes=
}}
|}

Critical hit rate is enhanced by the following effects:
*[[Rogue's Roll]]: Up to +27% critical hit rate depending on result, [[Phantom Roll]]+ equipment, and THF in pt or relic hat proc.
*[[Blood Rage]]: +20% critical hit rate while in effect.
*[[Impetus]]: Up to +50% critical hit rate with consecutively landed attacks.
*[[Mighty Strikes]]: 100% critical hit rate while in effect.

==Critical Hit Damage==
Critical Hit Damage is determined by [[Base Damage]], [[fSTR]], [[pDIF|Critical pDIF]], and the sum of modifiers such as [[Critical Attack Bonus]] [[:Category:Job Traits|job trait]] and the other [[:Category:Job Ability|Job Abilities]]/equipment that enhance it directly. The bonus is capped at +100% maximum total from all sources (abilities, traits, gear, atma, etc.). 
'''Equation:''' Critical Hit Damage = ([[Base Damage]] + [[fSTR]]) * [[pDIF|Critical pDIF]] * (Sum of Direct Modifiers)

Critical Hit Damage is enhanced by the following effects:
*[[Critical Attack Bonus]]: +5~14% depending on tier of trait.
*[[Dead Aim]]: +10~45% depending on tier of trait, for ranged attacks, not including weapon skills.
*[[Impetus]]: Up to +50% with consecutive attacks landed while using [[Bhikku Cyclas +3]]

==Enemy Critical Hit Rate==
*Enemy critical hit rate is a merit category available to all jobs. It can be merited a total of 5 times. Each merit upgrade grants a 1% decrease in the rate of critical hits by enemies against the player. It costs 15 merits to fully upgrade (1>2>3>4>5).
*Enemy Critical Hit rate seems to be calculated approximately the same as Player [[Critical Hit Rate]], but using the Enemy's [[DEX]] and the Player's [[AGI]]. This means that, in situations where the Player has a large [[AGI]] bonus like [[Abyssea]], the Enemy's critical hit rate is at the 5% unmerited [[Critical Hit Rate]] minimum. Merit points and Equipment can further reduce this, but it appears to have a 1% minimum.
**Equipment examples: [[Eluder's Sachet]], [[Warden's Ring]], [[Fortified Ring]].
**For tanks considering how easy it is to go to 0 damage taken while under the effect of [[Phalanx]] it is worth considering items with this stat to reduce the spike damage of critical hits.
*Enemy Critical Hit rate appears to cap at 10%, regardless of how high the Enemy's DEX is. (Exceptions include status enhancements like [[Mighty Strikes]] or critical evasion enfeebles such as [[Stardiver]] or [[Feather Step]]).

==Enemy Critical Hit Damage==
* [[VIT]] plays a role in reducing enemy critical hit damage, but the specific effect is unknown.
** This effect is only on the player side, not for monsters.
* Reduced by [[Crit. Def. Bonus]] trait.
* Can be increased by equipping the {{ItemIcon|Mujin Tanto|22}} {{tooltip|text=[[Mujin Tanto]]|tooltip=[[File:Mujin Tanto description.png]]}}.

==Related Links==
*[https://www.bluegartr.com/threads/90728-Final-Form-Magian-Weapons?p=4662716#post4662716 Blade: Rin Testing (Xera, BG)]
*[https://www.bluegartr.com/threads/68786-Dexterity-s-impact-on-critical-hits/ DEX/Crit rate research (BG forums)]
*[http://ffxi.allakhazam.com/forum.html?forum=261&mid=135208186510825877&p=1#1 AGI/Crit rate research (Melphina, Alla)]
*[https://www.bluegartr.com/threads/113755-Ranged-Critical-Hit-Rate-Testing?p=5507978&viewfull=1#post5507978 More AGI/Crit rate research (Byrth, BG)]
*[https://www.bluegartr.com/threads/68786-Dexterity-s-impact-on-critical-hits#post2465157 Dexterity's Impact on Critical Hits]
*[https://forum.square-enix.com/ffxi/threads/7267-May-10-2011-%28JST%29-Version-Update May 2011 Version Update "VIT will play a role in calculating damage taken from critical hits."]
*[https://imatan19.blog.fc2.com/blog-entry-647.html Monster Crit rate via dDEX (JP blog)]
[[Category:Game Mechanics]]
[[Category:Game Terms]]
[[Category:Derived Stats]]

Critical Hit Rate - Revision history

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