Evasion

Evasion Rating grants a chance to Evade enemy preventing them from you at all. Exact chance to Evade also depends on the attacker's

Evasion is one of the three core defences that can be found on equipment. It is associated with dexterity and provides an entropy-based system of damage avoidance against most types of hits. Evasion chance is based on your Evasion Rating versus the enemy's Accuracy Rating.

Mechanics

Evading an attack prevents all damage from the attack and other hit-related effects. For projectiles, evasion prevents collision. Chance to evade/chance to hit is determined by a function of the defender's evasion rating against the attacker's accuracy rating. Chance to hit cannot go below 5%; likewise, chance to evade cannot exceed 95%.

The formula to calculate evasion chance is as follows: $\color [rgb]{0.6392156862745098,0.5529411764705883,0.42745098039215684}{\text{Uncapped Chance to Hit}}={{\text{Attacker's Accuracy}}*1.25*100 \over ({\text{Attacker's Accuracy}}+{\text{Defender's Evasion * 0.3}})}$ ^[1]

Additionally, if the evasion check fails, leading to a hit, and that hit would deal a critical hit, the chance to evade is tested again independently. If this check is passed, the critical hit is downgraded to a non-critical hit.^[2]

Distance

Player attacks have an accuracy penalty that drops off with distance from the attacker between 2 metres (no penalty) and 9 metres (90% less accuracy rating); this primarily affects projectile skills.

Enemies do not have an accuracy penalty, but can be given one with Tactician's Stay Light, Use Cover or Vigilant ViewVigilant View
Emerald RingRequires Level 26+(120-160) to Accuracy Rating+(100–150) to Accuracy Rating
+(100–150) to Evasion Rating
(10–20)% increased Rarity of Items found
+(20–30) to Dexterity
Enemies have an Accuracy Penalty against you based on Distance
Maximum Chance to Evade is 50%Agony brings clarity to those of pure mind..

Entropy

Evasion is not a random system. Instead, it uses a deterministic "entropy" system that ensures a hit will occur after a certain number of evades:

If it is the first time an entity is attacked, or if the time since the last attempted hit exceeds 100 server ticks (3.33 seconds), randomize the entropy value from 0-99.
Calculate the attacker's chance to hit against the defender's chance to evade, and add this integer to the entropy value.
If the resulting entropy value is lower than 100, the hit counts as evade. When the value reaches 100 or greater, the check counts as a hit, and subtract 100 from the entropy value.

The secondary critical hit downgrade test does not affect the entropy value.

Example: A player is fighting three monsters, one (A) with a 70% chance to hit and two (B, C) with a 45% chance to hit.

A attacks. The player's entropy value is a random number between 0-99, in this case 37.

A's attack adds 70 to the counter, raising it to 107. This counts as a hit. 100 is then subtracted from entropy, leaving a value of 7.

B attacks, adding 45 to entropy. Entropy value is now 52

C attacks, adding 45 to entropy. Entropy value is now 97

A attacks, adding 70 to entropy. Entropy value is now 167. This hits, 100 is subtracted from entropy, and the value becomes 67. It happens to be a critical hit, which means it has a 70% chance to do bonus damage, but this roll is independent and doesn't affect entropy.

The player runs away for more than 3.33 seconds (100 ticks), so a new entropy value will be rolled on the next attack.

As a result, if a player has a 1 in N chance to be hit, then the player will be hit exactly once for every N consecutive attacks. This eliminates all possibilities of lucky and/or unlucky streaks. It is still based on chance because of the entropy's value randomization in the first step. Note that if multiple mobs are attacking one character, all of the mobs' attacks share the same entropy value. The chance to evade shown in the character stats window is based on the average accuracy of a monster at the player's level.

Other mechanics

When defending against monster hits, there is no distinction between attacks and spells and will apply to any attack from enemies except boss attacks with a red flash.

When attacking monsters, their evasion provides avoidance against all attack hits, interacting with accuracy/chance to hit. Monsters cannot evade spell hits.

Bypassing evasion

Effects that state Can't be Evaded or Always Hit (e.g. Killing PalmKilling PalmAttack, AoE, Melee, Strike, Physical
Tier: 1
Level: (1-20)
Cost: (6-42) Mana
Attack Speed: 75% of base
Attack Damage: (90-281)% of baseRequires: QuarterstaffDash to an enemy and Strike them, Culling enemies if their life is low enough. Each enemy killed by this strike grants a Power Charge, with higher Rarity monsters granting additional Charges. Enemies around you that can be Culled will be highlighted.Culling Strike
Can't be Evaded
Normal and Magic monsters grant 1 Power Charge
Rare monsters grant 2 Power Charges
Unique monsters grant 3 Power Charges

Additional Effects From 1-20% Quality:
Recover (0.2-4)% of maximum Mana over four seconds on Culling an EnemySkills can be managed in the Skills Panel.) will raise the chance to hit to 100%, ignoring all accuracy and evasion stats of the attacker and defender respectively.
Cannot Evade (e.g. BramblejackBramblejack
Rusted CuirassArmour: 45
Movement Speed: -5.0%+(60-100) to maximum Life
+(60-100) to Stun Threshold
Cannot Evade Enemy Attacks
250% of Melee Physical Damage taken reflected to Attacker
Regenerate 5% of Life per second while SurroundedIt is safer to be feared than to be loved.) does the same, in reverse; all skills against the subject will hit regardless of accuracy.
Pinned targets cannot evade attacks.
The Parried debuff applied by Parry negates evasion.

Related mechanics

Blind

Blind is a debuff that reduces the target's Evasion and Accuracy by 20% and lowers their vision radius to minimum.

Maim

Maim is a debuff that reduces the target's movement speed by 30% and Evasion Rating by 15%.

Related skills

Gem	Tier
ParryParryAttack, Melee, Physical, Duration, Channelling Level: 1 Attack Time: 0.75 sec Critical Strike Chance: 5.00% Attack Damage: 65% of baseRequires: BucklerReady your Buckler to parry the next Strike or Projectile that would Hit you, Blocking the Hit and retaliating with a quick sweep that leaves enemies off balance, causing them to take massively increased Attack damage for a short duration. Parrying causes you to accumulate Heavy Stun buildup. You cannot Evade a Hit you could parry, but Evasion instead grants an equal chance to avoid this Heavy Stun buildup.Can't be Evaded 400% more Stun buildup Can Block Damage from enemies within 1 metre Parried Debuff makes targets take 50% more Attack Damage Parried Debuff duration is 2 seconds 3 to 4 Added Physical Damage per 5 Evasion Rating on BucklerSkills can be managed in the Skills Panel.	0
Raise ShieldRaise ShieldAttack, AoE, Melee, Physical, Channelling Level: 1 Attack Time: 0.55 sec Critical Strike Chance: 5.00% Attack Damage: 80% of baseRequires: Armoured ShieldRaise your Shield to Block all incoming Blockable hits. Release immediately after Blocking when an enemy is close to perform a Shield Bash, damaging and Stunning enemies. While your Shield is raised you cannot be Light Stunned by hits you Block, but Blocking too much damage may Heavy Stun you. You cannot Evade while your Shield is raised, but Evasion instead grants an equal chance to avoid this Heavy Stun buildup.Shield Bash causes 600% more Heavy Stun buildup Shield Bash always Light Stuns Shield Bash Dazes if holding a Tower Shield Shield Bash can't be Evaded Shield Bash deals 3 to 4 Physical Damage per 5 Armour on ShieldSkills can be managed in the Skills Panel.	0
Killing PalmKilling PalmAttack, AoE, Melee, Strike, Physical Tier: 1 Level: (1-20) Cost: (6-42) Mana Attack Speed: 75% of base Attack Damage: (90-281)% of baseRequires: QuarterstaffDash to an enemy and Strike them, Culling enemies if their life is low enough. Each enemy killed by this strike grants a Power Charge, with higher Rarity monsters granting additional Charges. Enemies around you that can be Culled will be highlighted.Culling Strike Can't be Evaded Normal and Magic monsters grant 1 Power Charge Rare monsters grant 2 Power Charges Unique monsters grant 3 Power Charges Additional Effects From 1-20% Quality: Recover (0.2-4)% of maximum Mana over four seconds on Culling an EnemySkills can be managed in the Skills Panel.	1
Staggering PalmStaggering PalmAttack, Buff, AoE, Melee, Strike, Projectile, Physical, Duration Tier: 3 Level: (1-20) Cost: (7-47) Mana Attack Speed: 75% of base Attack Damage: (80-250)% of baseRequires: QuarterstaffDash to an enemy and Strike them, instantly Heavily Stunning enemies which are Primed for Stun. Heavy Stunning an enemy with this Skill grants you a Buff that causes your Quarterstaff Attacks to also fire Projectiles for a short duration. Heavy Stunning additional enemies adds to the Buff's duration.Can't be Evaded Buff duration is 7.5 seconds Maximum Buff duration is 30 seconds Additional Effects From 1-20% Quality: (2-40)% chance to Blind EnemiesSkills can be managed in the Skills Panel.	3
Hand of ChayulaHand of ChayulaAttack, AoE, Melee, Strike, Chaos, Meta Tier: 9 Level: (1-20) Cost: (11-79) Mana Attack Speed: 75% of base Attack Damage: (67-209)% of baseRequires: QuarterstaffDash to an enemy and Strike them, triggering socketed Marks with increased effect and applying socketed Curses with increased duration.Strike Converts 73% of Physical Damage to Chaos Damage Can't be Evaded Support 100% increased duration of socketed Curses (20–29)% increased Effect of Socketed MarksPlace one or more Skill Gems into this Meta Gem's sockets in the Skills Panel. The socketed Skills will be incorporated into the Meta Gem's effect.	9
Shattering PalmShattering PalmAttack, AoE, Melee, Strike, Cold Tier: 11 Level: (1-20) Cost: (5-40) Mana Attack Speed: 75% of base Attack Damage: (35-109)% of baseRequires: QuarterstaffDash to an enemy and Strike them with an Attack that manifests a wave of cold, coating nearby enemies in shards of ice. Dealing enough damage to these enemies will shatter the shards, causing an icy explosion that deals Attack damage.Converts 60% of Physical Damage to Cold Damage Can't be Evaded Attaches Shards to enemies within a 3.8 metre radius Additional Effects From 1-20% Quality: (1-20)% more Critical Hit ChanceSkills can be managed in the Skills Panel.	11
Spear of SolarisSpear of SolarisAttack, AoE, Projectile, Sustained, Fire, Conditional Tier: 13 Level: (1-20) Cost: (13-91) Mana Attack Damage: (150-612)% of baseRequires: SpearBuild Glory by Heavy Stunning enemies. When you have maximum Glory you may call forth the Azmeri goddess Solaris, jumping backwards and throwing your Spear in the air. On landing the spear deals heavy damage in an area, then calls a divine skybeam that pulses periodically and creates expanding Ignited Ground. Modifiers to number of Projectiles fired do not apply to this skill.Impact Requires 20 Glory to use Generates 100% of Monster Power as Glory for this Skill on Heavy Stunning an enemy Converts 75% of Physical Damage to Fire Damage +1.4 seconds to Total Attack Time Can't be Evaded Impact radius is 2 metres Pulse Attack Damage: (27–110)% of base Generates 100% of Monster Power as Glory for this Skill on Heavy Stunning an enemy Ground spear pulses every 0.2 seconds, up to 20 times Converts 75% of Physical Damage to Fire Damage Pulse radius is 2 metres Ignited Ground Attack Damage: (350–1429)% of base Generates 100% of Monster Power as Glory for this Skill on Heavy Stunning an enemy Converts 100% of Physical Damage to Fire Damage Ignited Ground radius is 2 metres Gains Radius over the Ground Spear's lifetime, up to 30% more at the end of the Spear's lifetime Additional Effects From 1-20% Quality: (1.25-25)% chance to retain 40% of Glory on useSkills can be managed in the Skills Panel.	13
Hammer of the GodsHammer of the GodsAttack, AoE, Melee, Slam, Duration, Conditional Tier: 13 Level: (1-20) Cost: (10-73) Mana Attack Speed: 50% of base Attack Damage: (580-1529)% of baseRequires: One Hand Mace, Two Hand MaceBuild Glory by Heavy Stunning enemies. When you have maximum Glory you may entreat the Ancestors to crush your enemies, manifesting a massive hammer that falls from the sky onto your target, Slamming into the ground after a short duration and dealing immense damage based on your weapon.Requires 20 Glory to use Generates 100% of Monster Power as Glory for this Skill on Heavy Stunning an enemy Can't be Evaded While Dual Wielding, both weapons hit with 30% less damage Impact radius is 2.4 metres Hammerfall duration is 2.5 seconds Additional Effects From 1-20% Quality: +(0.02-0.4) metres to impact radiusSkills can be managed in the Skills Panel.	13

Persistent skills

Gem	Tier
Sorcery WardSorcery WardSpell, Buff, Persistent, Lightning, Cold, Fire Level: (1-20) Cast Time: 1.00 secPassively manifests a protective barrier which takes Elemental Damage from Hits for you until depleted. The barrier instantly recharges to its full value a short time after it stops taking damage or is fully depleted.Barrier recharges after (8-6.1) seconds Elemental Damage from Hits is taken from the Barrier before your Life, Mana or Energy Shield Barrier can take Elemental Damage up to 30% of your Armour and Evasion Rating Additional Effects From 1-20% Quality: Barrier can take Elemental Damage up to an additional +(0.25-5)% of your Armour and Evasion RatingSkills can be managed in the Skills Panel.	0
Wind DancerWind DancerBuff, Attack, Persistent, AoE, Melee, Staged Tier: 4 Level: (1-20) Reservation: 30 SpiritRequires: Any Martial WeaponWhile active, periodically grants stages of a buff that gives you more Evasion per stage. Being Hit by an Enemy while you have this buff consumes all stages to damage and Knock Back enemies around you.3 maximum stages Gain a stage every (1.5-1.12) seconds 10% more Evasion Rating per stage On being Hit by an Enemy, consume all stages to trigger Gale ForceSkills can be managed in the Skills Panel.	4
Ghost DanceGhost DanceBuff, Persistent, Duration Tier: 4 Level: (1-20) Reservation: 30 SpiritWhile active, causes you to periodically gain Ghost Shrouds. If you are Hit while you have a Ghost Shroud, it is immediately consumed to recover Energy Shield based on your Evasion.(4-3.05) second duration between gaining Ghost Shrouds Maximum (3-5) Ghost Shrouds When Hit, Consume a Ghost Shroud to recover Energy Shield equal to 5% of your Evasion Additional Effects From 1-20% Quality: Ghost Shrouds recover Energy Shield equal to +(0.1-2)% of your EvasionSkills can be managed in the Skills Panel.	4
Magma BarrierMagma BarrierBuff, Attack, Persistent, AoE, Melee, Trigger, Fire, Duration Tier: 4 Level: (1-20) Reservation: 30 Spirit Attack Damage: (120-490)% of baseWhen you raise your Shield it is infused with magma for a short time. Blocking during this time will spray magma at the attacker and grant you an Endurance Charge.Buff Fully imbues Shield in 8 seconds Grants 25% increased Block chance Magma Spray Critical Hit Chance: 5.00% Attack Damage: (170-694)% of base 6 to 8 Added Fire Damage per 15 Armour on Shield 6 to 8 Added Fire Damage per 15 Evasion on Shield (4–103) to (6–155) Base Off Hand Fire Damage Magma Spray radius is 2.8 metres Additional Effects From 1-20% Quality: Grants (0–5)% increased Block chancePlace into a Skill Gem socket to gain this skill. Sockets are found in the Skills menu tab.	4
Defiance BannerDefiance BannerBanner, Buff, Persistent, AoE, Aura, Duration Tier: 8 Level: (1-20) Reservation: 30 SpiritWhile active, killing enemies with Attacks or standing near a Unique enemy generates Valour. Using this Skill consumes its Valour to place an inspiring Banner with an Aura that grants you and nearby Allies Armour, Evasion and movement speed while the Banner lasts. The Banner cannot gain Valour while placed, and you cannot place a Banner while you already have a Banner placed.Attack kills generates Valour equal to the enemy's Power Gains 1 Valour per second while a Unique enemy is in your Presence 10% more Aura Magnitudes per Valour Banner Aura radius is 4.5 metres Aura grants (6–9)% more Armour and Evasion Rating Aura grants 5% increased movement speed Banner duration is (6–6.95) seconds, or until you leave the AuraSkills can be managed in the Skills Panel.	8

Support gems

Gem	Tier
Window of Opportunity IIWindow of Opportunity IISupport, Channelling Category: Window of Opportunity Tier: 5Support Requirements: +5 DexSupports Channelling skills that have special effects if released with Perfect Timing, causing them to deal much more damage and grant Perfect Deflection if released with Perfect Timing but reducing the Perfect Timing window.Releasing Supported Skills with Perfect Timing grants Deflection Rating equal to 15% of Evasion Rating for 8 seconds Supported Skills have a 35% shorter Perfect Timing window Supported Skills deal 35% more Damage when released with Perfect TimingPlace into a Skill's Support Gem socket in the Skills Panel to apply its effects to that Skill. You cannot have multiple Support Gems of the same Category socketed within one Skill.	5

Related unique items

Item	Base item	Item class		Stats
BramblejackBramblejack Rusted CuirassArmour: 45 Movement Speed: -5.0%+(60-100) to maximum Life +(60-100) to Stun Threshold Cannot Evade Enemy Attacks 250% of Melee Physical Damage taken reflected to Attacker Regenerate 5% of Life per second while SurroundedIt is safer to be feared than to be loved.	Rusted Cuirass	Body Armour	1	+(60-100) to maximum Life +(60-100) to Stun Threshold Cannot Evade Enemy Attacks 250% of Melee Physical Damage taken reflected to Attacker Regenerate 5% of Life per second while Surrounded
Vigilant ViewVigilant View Emerald RingRequires Level 26+(120-160) to Accuracy Rating+(100–150) to Accuracy Rating +(100–150) to Evasion Rating (10–20)% increased Rarity of Items found +(20–30) to Dexterity Enemies have an Accuracy Penalty against you based on Distance Maximum Chance to Evade is 50%Agony brings clarity to those of pure mind.	Emerald Ring	Ring	26	+(120-160) to Accuracy Rating+(100–150) to Accuracy Rating +(100–150) to Evasion Rating (10–20)% increased Rarity of Items found +(20–30) to Dexterity Enemies have an Accuracy Penalty against you based on Distance Maximum Chance to Evade is 50%

Version history

Version	Changes
0.3.0	Player Evasion now works on all hits except boss skills that have a red flash. The Evasion formula has been adjusted to lower the percentage of hits that will be evaded by a given amount of evasion.
0.2.0f	Fixed a bug where players were gaining 1% of their Evasion Rating as Armour at all times. This also fixes a bug where the Iron Reflexes Keystone Passive Skill and General's Bindings Notable Passive Skill were not providing the correct amount of Armour.
0.1.0	Introduced to the game.

References

[1] ttps://www.reddit.com/r/PathOfExile2/comments/1n2tefy/comment/nb8wufb

[2] ttps://www.pathofexile.com/forum/view-thread/11707/filter-account-type/staff/page/10#p748465

[1]

[2]