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Stun

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Whenever a player or monster takes damage from a hit, there is a chance they will be stunned. A stun interrupts whatever that creature was doing while a brief animation is played.

Neither damage over time nor reflect can cause stun.[1]

Mechanics

The chance to stun is based off the damage done in a single hit compared to the target's maximum life. The default length of stuns is 350ms.[2]

The duration of stuns can be altered by increased Block and Stun Recovery, increased Stun Duration on enemies, increased Stun Duration with Two Handed Melee Weapons on enemies and similar modifiers.

Whether or not a stun occurs can be calculated using the following formula:[2]

stun_chance [%] = 200 * damage / defender_effective_max_life

In other words, in single-player a enemy will be stunned a mean of two time throughout its lifetime, assuming no regeneration or "wasted" damage.

Where defender_effective_max_life is what the maximum life of the creature would be in a single-player map. Increases to monster life from a party of more than one player do not affect defender_effective_max_life.

For a player with Chaos Inoculation, their defender_effective_max_life is whatever their maximum life would be if they did not have Chaos Inoculation.[3]

If the chance to stun would be less than or equal to 20%, it is ignored,[4] so you need to deal more than 10% of effective maximum life to have a chance to stun. Dealing at least 50% of maximum life will always stun.

Stun threshold

Reduced stun threshold modifiers reduce the value of defender_effective_max_life. For example, 25% reduced Enemy Stun Threshold means the enemy will be treated as if their defender_effective_max_life is only 75% as much as it actually is, increasing the chance that the enemy will be stunned.[2]

When the total Stun Threshold Reduction would be over 75%, it is instead treated as being:

75 + ( Stun Threshold Reduction - 75) * 25 / ( Stun Threshold Reduction -50 )

The net effect on the mean number of stuns during a monster's lifetime is as follows:

  • Hyperbolic regime: From 0 to 75% Reduced Stun Threshold, the mean number of stuns per lifetime increases from 2 to 8, accelerating as it goes.
  • Linear regime: Every 3.125% Reduced Stun Threshold past 75% increases the mean number of stuns per lifetime by 1.
Example

If a player has a total of 110% reduced Enemy Stun Threshold from gear and skills, the actual value that gets used would be:

75 + ( 110 - 75 ) * 25 / ( 110 - 50 )
75 + 35 * 25 / 60
75 + 35 * 0.42
75 + 14.6 = 89.6% reduced Enemy Stun Threshold
Reduced threshold Eff. reduced threshold Min life for stun Min life for 100% stun
0% 0% 10% 50%
5% 5% 9.5% 47.5%
10% 10% 9% 45%
15% 15% 8.5% 42.5%
20% 20% 8% 40%
25% 25% 7.5% 37.5%
30% 30% 7% 35%
35% 35% 6.5% 32.5%
40% 40% 6% 30%
45% 45% 5.5% 27.5%
50% 50% 5% 25%
55% 55% 4.5% 22.5%
60% 60% 4% 20%
65% 65% 3.5% 17.5%
70% 70% 3% 15%
75% 75% 2.5% 12.5%
80% 79.2% 2.08% 10.4%
85% 82.1% 1.79% 9%
90% 84.4% 1.56% 7.8%
95% 86.1% 1.39% 7%
100% 87.5% 1.25% 6.25%
105% 88.6% 1.14% 5.7%
110% 89.6% 1.04% 5.2%
115% 90.4% 0.96% 4.8%
120% 91.1% 0.89% 4.5%
125% 91.7% 0.83% 4.2%
130% 92.2% 0.78% 3.9%
135% 92.6% 0.74% 3.7%
140% 93.1% 0.69% 3.5%
145% 93.4% 0.66% 3.3%
150% 93.8% 0.62% 3.1%

Avoiding stun

There are passive skills and item modifiers that grants a chance to avoid becoming stunned:

  • As long as a creature has greater than 0 energy shield, it has a 50% chance to ignore a stun.[3] This is calculated independently of the creature's chance to be stunned. First the chance to stun is calculated as normal, and if the stun check succeeds and would cause a stun, there is then a 50% chance that the stun can be ignored. An attack that removes energy shield can have its stun avoided, even though energy shield is 0 after damage is applied. Players lose this chance to ignore a stun with the Eldritch Battery keystone node.[5]
  • The modifier +#% chance to Avoid being Stunned.
  • The modifier +#% chance to Avoid interruption from Stuns while Casting.

The above modifiers are not doing the same thing, and apply at different times. They are not, and cannot be, additive with each other.[6][7]

Example

A character with considerable amount of energy shield is continuously casting a spell. The character has following mods:

  • +38% chance to Avoid being Stunned
  • +25% chance to Avoid interruption from Stuns while Casting

When the character then gets hit that normally would cause a stun. However, due to all the avoidance modifiers the actual chance to become stunned is:

 (1 - 0.5) * (1 - 0.38) * (1 - 0.25) = 23.25% 

Stun immunity

  • Unwavering Stance
  • Eye of Chayula inventory icon.pngEye of ChayulaEye of Chayula
    Onyx Amulet
    Requires Level 20+(10-16) to all Attributes20% reduced maximum Life
    30% increased Rarity of Items found
    Cannot be Stunned
    Never blinking, always watching.
    Eye of Chayula inventory icon.png
  • Ezomyte Peak inventory icon.pngEzomyte HoldEzomyte Hold
    Iron Hat
    Armour: (23 to 33)Requires 9 Str20% increased Physical Damage
    +(15-25) to Armour
    +(25-50) to maximum Life
    Cannot Evade Enemy Attacks
    Cannot be Stunned
    A moment of victory may last an eternity in memory.
    Ezomyte Peak inventory icon.png
  • Kaom's Roots inventory icon.pngKaom's RootsKaom's Roots
    Titan Greaves
    Armour: 210Requires Level 68, 120 StrHas no Sockets
    Cannot be Knocked Back
    +(120-150) to maximum Life
    Unwavering Stance
    Don't flinch. It's a waste of good hitting time.
    Kaom's Roots inventory icon.png
  • Lioneye's Paws inventory icon.pngLioneye's PawsLioneye's Paws
    Bronzescale Boots
    Armour: 48
    Evasion: 48
    Requires Level 30, 30 Str, 30 Dex+(40-60) to Strength
    +(40-60) to Dexterity
    Adds 12 to 24 Fire Damage to Attacks
    20% increased Movement Speed
    40% reduced Movement Speed when on Low Life
    20% increased Stun and Block Recovery
    Cannot be Stunned when on Low Life
    Stand and lead the righteous pride,
    Fight till death, never hide.
    Lioneye's Paws inventory icon.png
    (on low life)
  • Spire of StoneSpire of Stone
    Crimson Jewel
    Limited to: 1Radius: Large3% increased Totem Life per 10 Strength in Radius
    Totems cannot be Stunned
    The strongest Karui tribes left the longest impressions on the land.
    Their symbols served as guidance many generations
    after their creators had been buried deep beneath the earth.
    Place into an allocated jewel socket on the Passive Skill Tree. Right click to remove from the Socket.
    (for totems)

Related skills

A list of skill gems that relates to stun.
Skill gemInt.Dex.Str.Lvl.
Cast when Stunned Support inventory icon.pngCast when Stunned SupportCast when Stunned SupportSupport, Spell, Trigger
Icon: !
Can store 1 use(s)
Cooldown Time: 0.25 sec
Drop Level: 38
Requires Level 38
Per 1% Quality:
0.5% increased Damage
(50-69)% chance to Cast Supported Spells when you are Stunned, or
Block a Stunning Hit
You cannot Cast Supported Spells directly
This is a Support Gem. It does not grant a bonus to your character, but to skills in sockets connected to it. Place into an item socket connected to a socket containing the Active Skill Gem you wish to augment. Right click to remove from a socket.
Cast when Stunned Support inventory icon.png
yesyesN/A38
Endurance Charge on Melee Stun Support inventory icon.pngEndurance Charge on Melee Stun SupportEndurance Charge on Melee Stun SupportSupport, Melee, Attack
Icon: e
Mana Multiplier: 110%
Drop Level: 18
Requires Level 18
Per 1% Quality:
1% increased Stun Duration on Enemies
(0-19)% reduced Enemy Stun Threshold
Gain an Endurance Charge if you Stun an Enemy with Melee Damage
This is a Support Gem. It does not grant a bonus to your character, but to skills in sockets connected to it. Place into an item socket connected to a socket containing the Active Skill Gem you wish to augment. Right click to remove from a socket.
Endurance Charge on Melee Stun Support inventory icon.png
N/AN/Ayes18
Ground Slam inventory icon.pngGround SlamGround SlamAttack, AoE, Melee
Radius: 35
Mana Cost: 6
Cast Time: 1.00 sec
Drop Level: 1The character slams the ground in front of them with their main hand weapon, creating a wave that travels forward and damages enemies with an increased chance to stun. Only works with Staves or Maces.Per 1% Quality:
1.5% increased Stun Duration on enemies
Deals (90-120.4)% of Base Attack Damage
25% reduced Enemy Stun Threshold
(0-19)% increased Area of Effect radius
Place into an item socket of the right colour to gain this skill. Right click to remove from a socket.
Ground Slam skill icon.png
Ground Slam inventory icon.png
N/AN/Ayes1
Heavy Strike inventory icon.pngHeavy StrikeHeavy StrikeAttack, Melee
Mana Cost: 5
Cast Time: 1.00 sec
Drop Level: 1Attacks the enemy with a forceful blow, knocking them back. Requires a Mace, Axe, Sword or Two-Handed Weapon.Per 1% Quality:
1% increased Stun Duration on enemies
Deals (150-193.7)% of Base Attack Damage
Knocks Enemies Back on Hit
25% reduced Enemy Stun Threshold
Place into an item socket of the right colour to gain this skill. Right click to remove from a socket.
Heavy Strike skill icon.png
Heavy Strike inventory icon.png
N/AN/Ayes1
Shield Charge inventory icon.pngShield ChargeShield ChargeAttack, AoE, Movement, Melee
Mana Cost: 8
Cast Time: 1.00 sec
Drop Level: 10
Requires Level 10
Charges at a targeted location or enemy, pushing away enemies in your path and repeatedly dealing damage in a small area in front of you. You deal damage in a larger area when you reach the target. The further you travel, the more damage you deal, and the greater your chance of stunning enemies.Per 1% Quality:
1% increased Damage
Deals (100-122.8)% of Base Attack Damage
50% increased Stun Threshold reduction on enemies at Maximum charge distance
75% increased Movement Speed
200% more Damage at Maximum Charge Distance
Deals 50% of Base Damage
Place into an item socket of the right colour to gain this skill. Right click to remove from a socket.
Shield Charge skill icon.png
Shield Charge inventory icon.png
N/AN/Ayes10
Stun Support inventory icon.pngStun SupportStun SupportSupport
Icon: t
Drop Level: 8
Requires Level 8
Per 1% Quality:
1.5% increased Stun Duration on Enemies
(30-49)% reduced Enemy Stun ThresholdThis is a Support Gem. It does not grant a bonus to your character, but to skills in sockets connected to it. Place into an item socket connected to a socket containing the Active Skill Gem you wish to augment. Right click to remove from a socket.
Stun Support inventory icon.png
N/AN/Ayes8
Vaal Ground Slam inventory icon.pngVaal Ground SlamVaal Ground SlamVaal, Attack, AoE, Melee
Souls per use: 24 (N) / 36 (C) / 48 (M)
Can store 3 use(s)
Cast Time: 1.00 sec
Drop Level: 1The character slams the ground with their main hand weapon, creating a wave that travels in all directions and damages enemies. Only works with Staves or Maces.Per 1% Quality:
1.5% increased Stun Duration on enemies
Deals (160-198)% of Base Attack Damage
100% increased Knockback Distance
20% increased Area of Effect radius
Stuns Enemies
Knocks Enemies Back on Hit
Can't be Evaded
Corrupted
Place into an item socket of the right colour to gain this skill. Right click to remove from a socket.
Vaal Ground Slam skill icon.png
Vaal Ground Slam inventory icon.png
N/AN/Ayes1
Warlord's Mark inventory icon.pngWarlord's MarkWarlord's MarkCurse, Spell, AoE, Duration
Radius: 22
Mana Cost: (24 to 50)
Cast Time: 0.50 sec
Drop Level: 24
Requires Level 24
Curses all targets in an area, making them more vulnerable to stuns. Hitting the cursed targets will leech life and mana, and killing them will result in a chance to gain an endurance charge.Per 1% Quality:
Cursed enemies have a 0.5% chance to grant an Endurance Charge when slain
Base duration is (6-9.8) seconds
(0-38)% increased Area of Effect radius
Cursed enemies have (21-30)% reduced Stun and Block Recovery
Cursed enemies have an additional 10% chance to be Stunned
Cursed enemies grant 2% Life Leech when Hit
Cursed enemies grant 2% Mana Leech when Hit
Cursed enemies have a (21-30)% chance to grant an Endurance Charge when slain
Place into an item socket of the right colour to gain this skill. Right click to remove from a socket.
Warlord's Mark skill icon.png
Warlord's Mark inventory icon.png
N/AN/Ayes24

Related items

The following items are related to stun.

Basic

  • Maces grant increased stun duration on enemies as an implicit.
  • Blunt Arrow Quiver inventory icon.pngBlunt Arrow QuiverBlunt Arrow QuiverDrop Level: 16
    Requires Level 16
    (25-35)% increased Stun Duration on Enemies
    Blunt Arrow Quiver inventory icon.png
    grants increased stun duration on enemies as an implicit.
  • Cloth Belt inventory icon.pngCloth BeltCloth BeltDrop Level: 20
    Requires Level 16
    (15-25)% increased Stun and Block Recovery
    Cloth Belt inventory icon.png
    grants increased stun recovery as an implicit.
  • Studded Belt inventory icon.pngStudded BeltStudded BeltDrop Level: 20
    Requires Level 16
    (20-30)% increased Stun Duration on Enemies
    Studded Belt inventory icon.png
    grants increased stun duration on enemies as an implicit.

Unique items

Offensive

NameModifiers

Defensive

NameModifiers
Spire of Stone
3% increased Totem Life per 10 Strength in Radius
Totems cannot be Stunned

Passive skills

Stun Recovery

Name Bonuses
Stun Mastery
  • 10% reduced Enemy Stun Threshold
  • 50% increased Stun and Block Recovery
  • 30% increased Stun Duration on Enemies

Increased Stun Threshold

Name Bonuses
Warrior's Blood
  • 1.8% of Life Regenerated per second
  • +20 to Strength
  • 20% increased Stun Threshold

Chance to avoid being Stunned

Name Bonuses
Stun Avoidance and Movement Speed
  • 2% increased Movement Speed
  • 8% chance to Avoid being Stunned
Heart of Oak
  • 8% increased maximum Life
  • 20% chance to Avoid being Stunned
  • 20% increased Stun and Block Recovery
  • 1% of Life Regenerated per second

Chance to avoid interruptions from Stuns while Casting

Name Bonuses
Avoid Interruption while Casting
  • 15% chance to Avoid interruption from Stuns while Casting
Practical Application
  • 25% chance to Avoid interruption from Stuns while Casting
  • +20 to Strength
  • +20 to Dexterity
Nimbleness
  • 4% increased Movement Speed
  • 6% increased Cast Speed
  • 15% chance to Avoid interruption from Stuns while Casting

Reduced Enemy Stun Threshold

Name Bonuses
Mace Damage and Reduced Enemy Stun Threshold
  • 10% increased Physical Damage with Maces
  • 4% reduced Enemy Stun Threshold with Maces
Stun Threshold Reduction
  • 5% reduced Enemy Stun Threshold
Heavy Draw
  • 24% increased Physical Damage with Bows
  • 20% increased Stun Duration with Bows on Enemies
  • 10% reduced Enemy Stun Threshold with Bows
Skull Cracking
  • 22% increased Physical Damage with Maces
  • 10% reduced Enemy Stun Threshold with Maces
  • Hits that Stun Enemies have Culling Strike
Stun Mastery
  • 10% reduced Enemy Stun Threshold
  • 50% increased Stun and Block Recovery
  • 30% increased Stun Duration on Enemies

Ascendancy Class Name Bonuses
Slayer
Slayer avatar.png
Two Handed Damage, Reduced Enemy Stun Threshold
  • 5% reduced Enemy Stun Threshold
  • 14% increased Damage with Two Handed Weapons

Stun Duration on Enemies

Name Bonuses
Stun Duration
    • 20% increased Stun Duration on Enemies
    • 25% increased Stun Duration on Enemies
Bone Breaker
  • 30% increased Physical Damage with Maces
  • 40% increased Stun Duration on Enemies
  • 5% increased Radius of Area Skills
Executioner
  • 24% increased Physical Damage with Two Handed Melee Weapons
  • 20% increased Stun Duration with Two Handed Melee Weapons on Enemies
  • Hits deal 20% increased Damage against Enemies that are on Low Life
Heavy Draw
  • 24% increased Physical Damage with Bows
  • 20% increased Stun Duration with Bows on Enemies
  • 10% reduced Enemy Stun Threshold with Bows
Martial Experience
  • 16% increased Physical Damage with Two Handed Melee Weapons
  • 10% increased Stun Duration with Two Handed Melee Weapons on Enemies
  • 4% increased Attack Speed with Two Handed Melee Weapons
  • 10% increased Accuracy Rating with Two Handed Melee Weapons
Stun Mastery
  • 10% reduced Enemy Stun Threshold
  • 50% increased Stun and Block Recovery
  • 30% increased Stun Duration on Enemies

Ascendancy Class Name Bonuses
Juggernaut
Juggernaut avatar.png
Armour, Stun Duration
  • 15% increased Armour
  • 20% increased Stun Duration on Enemies
Slayer
Slayer avatar.png
Overwhelm
  • Your Damaging Hits always Stun Enemies that are on Full Life
  • 100% increased Stun Duration against Enemies that are on Full Life
  • 100% increased Stun Duration against Enemies that are on Low Life
  • 20% chance to double Stun Duration

Stun immunity

Name Bonuses
Unwavering Stance
  • Cannot Evade enemy Attacks
  • Cannot be Stunned

Ascendancy Class Name Bonuses
Guardian
Guardian avatar.png
Bastion of Hope
  • 5% additional Block Chance
  • You and nearby Allies cannot be Stunned if you've Blocked Recently
  • 50% additional Block Chance for 1 second every 5 seconds
Slayer
Slayer avatar.png
Brutal Fervour
  • 100% increased Life Leeched per second
  • +10% of maximum Life per second to maximum Life Leech rate
  • Cannot be Stunned while Leeching
  • You are Immune to Bleeding while Leeching
Ascendant
Ascendant avatar.png
Juggernaut
  • 30% increased Armour
  • Cannot be Chilled
  • 10% chance to gain an Endurance Charge when you are Hit
  • You cannot be Stunned while at maximum Endurance Charges
Berserker
Berserker avatar.png
Rite of Ruin
  • 6% reduced Damage taken if you've Killed Recently
  • Cannot be Stunned if you've Killed Recently
  • 25% increased Attack Speed if you haven't Killed Recently
Juggernaut
Juggernaut avatar.png
Unbreakable
  • Cannot be Stunned
  • Armour received from Body Armour is doubled
Occultist
Occultist avatar.png
Vile Bastion
  • 0.5% of Energy Shield Regenerated per second for each

Enemy you've Killed Recently

  • Cannot Be Stunned while on Full Energy Shield

Miscellany

These passive skills are related to stun, but do not fit in any other category:

Ascendancy Class Name Bonuses
Slayer
Slayer avatar.png
Overwhelm
  • Your Damaging Hits always Stun Enemies that are on Full Life
  • 100% increased Stun Duration against Enemies that are on Full Life
  • 100% increased Stun Duration against Enemies that are on Low Life
  • 20% chance to double Stun Duration
Ascendant
Ascendant avatar.png
Slayer
  • Culling Strike
  • 30% increased Damage against Rare and Unique Enemies
  • 10% of Overkill Damage is Leeched as Life
  • Your Damaging Hits always Stun Enemies that are on Full Life

References

  1. Mark_GGG (July 14, 2014). "Possible to stun yourself on reflect with vulnerability?". Official Path of Exile Forums. Retrieved November 26, 2014.
  2. 2.0 2.1 2.2 Malice (November 13, 2011). "Mechanics Thread". Path of Exile Forum. Retrieved October 20, 2013.
  3. 3.0 3.1 Mark_GGG (October 25, 2012). "Stun and Reduced Stun Threshold: the quick and dirty way". Path of Exile Forum. Retrieved October 20, 2013.
  4. Mark_GGG (August 21, 2013 5:23 AM). "Vulnerability's additional chance to stun not applying". Path of Exile Forum. Retrieved August 21, 2013.
  5. Rory (April 18, 2015). "A potential change I'm keen to hear your thoughts on". Path of Exile Forum. Retrieved March 14, 2016.
  6. Mark_GGG (July 16, 2013). "Energy Shield's Chance to Ignore Stun is not additive with Chance to Avoid Stun". Path of Exile forum. Retrieved February 03, 2016.
  7. milesmeloro (July 17, 2013). "Energy Shield's Chance to Ignore Stun is not additive with Chance to Avoid Stun". Path of Exile subforum. Retrieved February 03, 2016.