Stun

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] A significantly long stun duration (700+ ms) will also display a swirling circle above the character or monster.^[3]

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.

Stun duration can be calculated using the following formula:^[2]

<math display="" style="background-color:transparent; padding:0;"> \color[RGB]{163,141,109} \text{ Stun duration } [ms] = 350 \times {100 + \text{Attacker's increased stun duration} \over 100 + \text{Defender's increased stun recovery} } </math>

(1)

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

<math display="" style="background-color:transparent; padding:0;"> \color[RGB]{163,141,109} \text{ Stun chance } [%] = 200 \times {\text{Damage} \over \text{Defender's effective max life} } </math>

(2)

Where <math display="" style="background-color:transparent; padding:0;"> \color[RGB]{163,141,109} \text{Defender's effective max life}

   </math> in equation (2) 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

<math display="" style="background-color:transparent; padding:0;"> \color[RGB]{163,141,109} \text{Defender's effective max life}

   </math>. For a player with Chaos Inoculation, their

<math display="" style="background-color:transparent; padding:0;"> \color[RGB]{163,141,109} \text{Defender's effective max life}

   </math> is whatever their maximum life would be if they did not have Chaos Inoculation.^[2]

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.

Melee damage have a +25% bonus to stun chance and non-physical damage have a -25% penalty to stun chance. Both of these will cancel each other out. Therefore, Damage can be calculated as the following:

<math display="" style="background-color:transparent; padding:0;"> \color[RGB]{163,141,109} \text{ Damage } = {(\text{Melee Physical Damage} \times 1.25) + \text{Melee Non-Physical Damage} + \text{Non-Melee Physical Damage} + (\text{Non-Melee Non-Physical Damage} \times 0.75) } </math>

(2)

Stun threshold

Reduced stun threshold modifiers reduce the value of <math display="" style="background-color:transparent; padding:0;"> \color[RGB]{163,141,109} \text{Defender's effective max life}

   </math>. For example, 25% reduced Enemy Stun Threshold means the enemy will be treated as if their

<math display="" style="background-color:transparent; padding:0;"> \color[RGB]{163,141,109} \text{Defender's effective max life}

   </math> 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:

<math display="" style="background-color:transparent; padding:0;"> \color[RGB]{163,141,109} 75 + 25 \times {(\text{Stun Threshold Reduction} - 75) \over (\text{Stun Threshold Reduction} - 50) } </math>

(3)

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 ▾ [Expand] ▾

If a player has a total of 110% reduced Enemy Stun Threshold from gear and skills, the actual value according to equation (3) that gets used would be:

<math display="" style="background-color:transparent; padding:0;"> \color[RGB]{163,141,109} 75 + 25 \times {(110 - 75) \over (110 - 50)}

   </math> = 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%

Stuns versus unique bosses

Unique bosses, such as Shaper, The Elder, Guardians of the Void, Elder Guardians, and Sirus, Awakener of Worlds become immune to stuns while stunned, and for 4 seconds after the fact.

Avoiding stun

There are passive skills and item modifiers that grant 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.^[5] 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.^[6]
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 additive with each other.^[7]^[8]

Example ▾ [Expand] ▾

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:

<math display="" style="background-color:transparent; padding:0;"> \color[RGB]{163,141,109} (1 - 0.50) \times (1 - 0.38) \times (1 - 0.25) = 23.25%

   </math>

Active skill gems

Related base stats

There are currently no active skill gems that have stats related to stun.

Related quality stats

Skill gem
Galvanic ArrowGalvanic ArrowLightning, Attack, Projectile, AoE, Bow Level: (1-20) Cost: (6-10) Mana Soul Gain Prevention: 0 sec Attack Damage: (80-99)% of base Effectiveness of Added Damage: (80-99)% Projectile Speed: 3260Releases arrows along with a burst of lightning which damages all enemies in a cone. The arrows degrade in-flight as the lightning dissipates, soon vanishing.Per 1% Quality:1Superior2Anomalous3Divergent1% increased Projectile Speed1% reduced Enemy Stun ThresholdCone Area occurs 4% farther forwardDeals (80-99)% of Base Attack Damage 50% of Physical Damage Converted to Lightning Damage Fires 2 additional Arrows (1-9) to (5-179) Added Lightning Damage Increases and Reductions to Arrow Speed also apply to this Skill's Area of Effect +(0-5) to radiusPlace into an item socket of the right colour to gain this skill. Right click to remove from a socket.				1
ArcArcSpell, Chaining, Lightning Level: (1-20) Cost: (8-23) Mana Cast Time: 0.70 sec Critical Strike Chance: 5.00% Effectiveness of Added Damage: 80%Requires Level 12An arc of lightning stretches from the caster to a targeted enemy and chains on to other nearby enemies. Each time the main beam chains it will also chain to a second enemy, but that secondary arc cannot chain further.Per 1% Quality:1Superior2Anomalous3Divergent4Phantasmal0.5% chance to Shock enemies1% increased Chaining range0.5% increased Damage for each time this Skill has Chained1% reduced Enemy Stun ThresholdDeals (6-133) to (33-754) Lightning Damage 10% chance to Shock enemies Chains +(4-7) Times (10-29)% increased Effect of Lightning Ailments 15% more Damage for each remaining ChainPlace into an item socket of the right colour to gain this skill. Right click to remove from a socket.				12
FirestormFirestormSpell, AoE, Duration, Fire Level: (1-20) Cost: (13-25) Mana Soul Gain Prevention: 0 sec Cast Time: 0.75 sec Critical Strike Chance: 6.00% Effectiveness of Added Damage: 55%Requires Level 28Flaming bolts rain down over the targeted area. They explode when landing, dealing damage to nearby enemies.Per 1% Quality:1Superior2Anomalous3Divergent1% increased DamageFirst Impact deals 3% more Damage with Hits and Ailments Base duration is 0.003 seconds1% reduced Enemy Stun ThresholdBase duration is 1.4 seconds Deals (22-207) to (33-311) Fire Damage One impact every 0.2 seconds First Impact deals 325% more Damage with Hits and Ailments First Impact has 100% more Area of Effect Maximum 3 Firestorms at a timePlace into an item socket of the right colour to gain this skill. Right click to remove from a socket.				28
DeterminationDeterminationAura, Spell, AoE, Physical Level: (1-20) Reservation: 50% Mana Cooldown Time: 1.20 sec Can Store 1 Use(s) Cast Time: Instant Radius: 36Requires Level 24Casts an aura that grants armour to you and your allies.Per 1% Quality:1Superior2Anomalous3Divergent2% increased Area of EffectYou and nearby Allies have 0.25% chance to Avoid being StunnedYou and nearby Allies gain 0.1% of Evasion Rating as Extra ArmourYou and nearby allies gain (32-51)% more Armour +(0-19) to radiusPlace into an item socket of the right colour to gain this skill. Right click to remove from a socket.				24
Ground SlamGround SlamAttack, AoE, Slam, Melee Level: (1-20) Cost: 6 Mana Attack Speed: 90% of base Attack Damage: (115-150)% of base Effectiveness of Added Damage: (115-150)% Radius: 35Slams the ground in front of you, creating a wave that travels forward and damages enemies with an increased chance to stun. The wave deals more damage to closer enemies. Requires an Axe, Mace, Sceptre, Staff or Unarmed.Per 1% Quality:1Superior2Anomalous3Divergent1% increased Stun Duration on enemies 0.5% increased Area of Effect0.5% increased Attack Speed3% increased Area of Effect 2% reduced angleDeals (115-188)% of Base Attack Damage 25% reduced Enemy Stun Threshold Deals up to (40-49)% more Damage to closer targets +(0-6) to radiusPlace into an item socket of the right colour to gain this skill. Right click to remove from a socket.				1
Heavy StrikeHeavy StrikeAttack, Melee, Strike Level: (1-20) Cost: 5 Mana Attack Speed: 85% of base Attack Damage: (195-250)% of base Effectiveness of Added Damage: (195-250)%Attacks enemies with a forceful blow, knocking them back. Requires a Mace, Sceptre, Axe, Sword or Two-Handed Weapon.Per 1% Quality:1Superior2Anomalous3Divergent1% increased Stun Duration on enemies 1% increased Damage1% increased Knockback Distance5% reduced Knockback DistanceDeals (195-313)% of Base Attack Damage Knocks Enemies Back on Hit 25% reduced Enemy Stun Threshold +(2-4) to Melee Strike Range 20% chance to deal Double DamagePlace into an item socket of the right colour to gain this skill. Right click to remove from a socket.				1

Support skill gems

Related base stats

There are currently no support skill gems that have stats related to stun.

Related quality stats

Skill gem
Cast when Stunned SupportCast when Stunned SupportSupport, Spell, Trigger Icon: ! Level: (1-20) Cooldown Time: 0.25 sec Can Store 1 Use(s)Requires Level 38Each supported spell skill will have a chance to be triggered when you are stunned. Cannot support skills used by totems, traps, or mines. Vaal skills, channelling skills, and skills that reserve mana cannot be triggered.Per 1% Quality:1Superior2Anomalous3DivergentSupported Skills deal 0.5% increased DamageSupported Skills have 1% increased Skill Effect Duration1% chance to Trigger Supported Spells when you are Stunned, or Block a Stunning Hit(50-69)% chance to Trigger Supported Spells when you are Stunned, or Block a Stunning Hit You cannot Cast Supported Triggerable Spells directlyThis 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.				38
Concentrated Effect SupportConcentrated Effect SupportSupport, AoE Icon: o Level: (1-20) Cost & Reservation Multiplier: 140%Requires Level 18Supports any skill with an area of effect, regardless of whether that skill deals damage.Per 1% Quality:1Superior2Anomalous3DivergentSupported Skills deal 0.5% increased Area DamageSupported Skills have 0.5% less Area of EffectSupported Skills have 0.5% reduced Enemy Stun ThresholdSupported Skills have 30% less Area of Effect Supported Skills deal (35-54)% more Area DamageThis 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.				18
Endurance Charge on Melee Stun SupportEndurance Charge on Melee Stun SupportSupport, Melee, Attack Icon: e Level: (1-20) Cost & Reservation Multiplier: 130%Requires Level 18Supports melee attack skills.Per 1% Quality:1Superior2Anomalous3DivergentSupported Skills have 1% increased Stun Duration on EnemiesSupported Skills deal 0.1% increased Damage per Endurance ChargeSupported Skills deal 1% increased Damage if you've lost an Endurance Charge in the past 8 seconds4% more Damage per Endurance Charge Gain an Endurance Charge when you Stun an Enemy with a Melee Hit from Supported Skills Supported Skills have (0-19)% 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.				18
Fist of War SupportFist of War SupportSlam, Attack, Melee, AoE, Support Icon: X Level: (1-20) Cost & Reservation Multiplier: 120%Requires Level 38Supports slam skills, providing a powerful boost when they're used, with a delay before they can be boosted again. Cannot support Vaal skills or triggered skills. Cannot modify the skills of minions. Only skills you use yourself can receive the boost.Per 1% Quality:1Superior2Anomalous3DivergentSupported Skills have 0.5% increased Area of EffectSupported Skills have 1% reduced Attack Speed Supported Skills deal 3% increased DamageAncestrally Boosted Slams have 0.5% reduced Enemy Stun ThresholdAncestrally Boosted Slams deal (110-148)% more Damage with Hits Ancestrally Boosted Slams deal (70-100)% more Damage with Ailments Ancestrally Boosted Slams have (40-59)% increased Area of Effect Attacks with Supported Skill are Ancestrally Boosted, no more than once every (2.5-1.8) seconds Ancestral Boost does not apply to repeats of the AttackThis 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.				38

Base items

One Hand Maces

Item		Stun Threshold

Two Hand Maces

Item		Stun Duration

Other items

Item		Stats

Unique items

Only unique items that add explicit stun-related stats are listed here.

Global stun threshold

Item		Threshold

Local stun threshold

Item		Threshold

Stun duration

Item		Duration

Stun recovery

Item		Recovery

Effects when enemy is stunned

Item		Stats

Stun avoidance

Item		Stats

Stun immunity

Item		Stats