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 0-75% 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.

Examples

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 Enemy Stun Threshold Effective Reduced Enemy Stun Threshold Minimum Percentage of life a hit needs to deal to stun Percentage of Life a hit needs to deal to have 100% stun chance
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%

Stun immunity

  • The Keystone Unwavering Stance provides stun immunity, but prevents the player from evading attacks.
    • The unique boots Kaom's RootsKaom's Roots
      Titan Greaves
      Armour: 210
      Requires Level 68, 120 Str
      Has no Sockets
      Cannot be Knocked Back
      +(120 to 150) to maximum Life
      Unwavering Stance
      Don't flinch. It's a waste of good hitting time.
      grant the player Unwavering Stance.
  • The unique amulet Eye of ChayulaEye of Chayula
    Onyx Amulet
    Requires Level 20
    +(10 to 16) to all Attributes20% reduced maximum Life
    30% increased Rarity of Items found
    Cannot be Stunned
    Never blinking, always watching.
    grants the player immunity to stun.
  • The unique boots Lioneye's PawsLioneye's Paws
    Bronzescale Boots
    Armour: 48
    Evasion: 48
    Requires Level 30, 30 Str, 30 Dex
    +(40 to 60) to Strength
    +(40 to 60) to Dexterity
    Adds 12–24 Fire Damage to Attacks
    20% increased Movement Speed
    40% reduced Movement Speed when on Low Life
    20% increased Stun Recovery
    Cannot be Stunned when on Low Life
    Stand and lead the righteous pride,
    Fight till death, never hide.
    grants the player immunity to stun when on low life.
  • The unique jewel 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.
    grants the player's totems immunity to stun.

Ascendancy Passives

The following Ascendancy class passive skills grant stun immunity:

Ascendancy Class Name Bonuses
Guardian
Guardian avatar.png
Bastion of Hope
  • 5% Chance to Block
  • You and nearby Allies cannot be Stunned if you've Blocked Recently
Slayer
Slayer avatar.png
Endless Hunger
  • 20% of Overkill Damage is Leeched as Life
  • Life Leech effects are not removed at Full Life
Ascendant
Ascendant avatar.png
Juggernaut
  • 30% increased Armour
  • Cannot be Chilled
  • 10% chance to gain an Endurance Charge when you are Hit
  • You can't be Stunned while you're 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
  • Immune to Stun while on Full Energy Shield

Avoiding stun

  • 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 notable node Heart of Oak grants +#% chance to Avoid being Stunned.
  • The notable nodes Practical Application and Nimbleness grants +#% chance to Avoid interruption from Stuns while Casting.
  • Leo can craft the mod +(25-35)% chance to Avoid being Stunned on helmets.

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% 

Skills

A list of skill gems that relates to stun.
Skill gemInt.Dex.Str.Lvl.
Endurance Charge on Melee Stun Support inventory icon.pngEndurance Charge on Melee Stun Support
Endurance 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 to 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 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 Slam
Ground SlamAttack, AoE, Melee
Radius: 35
Mana Cost: 6
Cast Time: 1.00 sec
Drop Level: 1
Requires Level 1
The 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
25% reduced Enemy Stun Threshold
(0 to 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 inventory icon.pngGround Slam skill icon.png
N/AN/Ayes1
Heavy Strike inventory icon.pngHeavy Strike
Heavy StrikeAttack, Melee
Mana Cost: 5
Cast Time: 1.00 sec
Drop Level: 1
Requires Level 1
Attacks 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
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 inventory icon.pngHeavy Strike skill icon.png
N/AN/Ayes1
Shield Charge inventory icon.pngShield Charge
Shield ChargeAttack, Melee, Movement
Mana Cost: 10
Cast Time: 1.00 sec
Drop Level: 10
Requires Level 10
Charges at an enemy, bashing it with the character's shield and striking it. This knocks it back and stuns it. Enemies in the way are pushed to the side. Damage and stun are proportional to distance travelled.Per 1% Quality:
1% increased Damage
200% increased Stun Duration on enemies at Maximum charge distance
(50 to 69)% increased Movement Speed
(200 to 428)% 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 inventory icon.pngShield Charge skill icon.png
N/AN/Ayes10
Stun Support inventory icon.pngStun Support
Stun SupportSupport
Icon: t
Drop Level: 8
Requires Level 8
Per 1% Quality:
1.5% increased Stun Duration on Enemies
(30 to 49)% reduced Enemy Stun ThresholdThis is a Support Gem. It does not grant a bonus to your character, but 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
Warlord's Mark inventory icon.pngWarlord's Mark
Warlord's MarkCurse, Spell, AoE, Duration
Radius: 16
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 (6.0 to 9.8) seconds
(0 to 38)% increased Area of Effect radius
Cursed enemies have (21 to 30)% reduced Stun Recovery
Cursed enemies have an additional (11 to 15)% chance to be Stunned
Cursed enemies grant 2.0% Life Leech when Hit
Cursed enemies grant 2.0% Mana Leech when Hit
Cursed enemies have a (21 to 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 inventory icon.pngWarlord's Mark skill icon.png
N/AN/Ayes24

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.