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Stun

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Whenever a player or monster takes damage, 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.
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%

Energy shield

As long as a creature has greater than 0 Energy Shield, it has a 50% chance to avoid 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 avoided. An attack that removes energy shield can have its stun avoided, even though energy shield is 0 after damage is applied.

Avoiding stun

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 your character immunity to stun. The Keystone Unwavering Stance also provides stun immunity, but prevents your character from evading attacks.

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 Malice (November 13, 2011; last updated February 23, 2013). "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.