Stun

Stun is a Negative Status in Arknights.

Effect

“	Unable to move, block, attack, or use skills.	”
	—In-game tip

A Stunned unit is indicated by a "dizzy" effect above them, with Operators and certain enemies (notably Mephisto and W) having a special animation used when they are Stunned. In this state, the unit is disabled where they cannot attack, move, use skills, and block enemies, the latter of which can be dangerous if the Stunned friendly unit is a frontline Operator as this will allow enemies to move past them! Stunned friendly units may still be retreated, however.

Sources

• U-Official's Short-Circuiting Genius talent Stuns all units, friendly and enemy, within her range for 5–7.5 seconds after a short delay from when she is deployed.

Friendly

• Stun Generators' EMP Blast Stun enemies in the surrounding tiles for 7 seconds (15 seconds for those in Pyrite Gorge).
• Mr. Booms' Ill Temper Stun enemies in the adjacent tiles for 12 seconds.
• Imprisonment Devices Stun enemies in its AoE for 2 seconds.
• Pulse Defense Modules on Multivariate Cooperation: Defence Protocols Stuns enemies in its lower part's AoE for 7 seconds.
• In Integrated Strategies, the "Eventide Terror" (Phantom & Crimson Solitaire)/Little Gran Faro (Mizuki & Caerula Arbor onward) Collectible Stuns all enemies present for 5 seconds when one enters a Protection Objective.
• Once a hostile Gelato Stop's HP reaches 0, it releases a wave that Stuns enemies in its range for 5 seconds.
• If Manfred is struck by the Londinium Secondary Defense Artillery, he will be Stunned for 8 seconds.
• Hands of the Saint Stun enemies that it comes in contact with for 1 second. If the Hand of the Saint - Patrol effect of the Little Handy's Housekeeping Assistant Module is selected, the Hands' Stun duration will be extended additively if they struck the same enemy multiple times.
• In Ideal City, the Self-Driving Cart Stuns enemies it collides with for 1 second, which can be extended to 2 seconds with Crash Bumper or 3 seconds with Assault Bumper.
• When the Materialist Antagonizer is defeated, it drops off Stitch Canvas who is Stunned for 30 seconds.
• When The Last Steam Knight's Pneumatic Pressurization expires, he will be Stunned for 5 seconds.
• In Caerula Arbor, if Saint Carmen/Saint Iberia is interrupted while reloading his handcannon, he will be Stunned for 10 seconds.
• In A Flurry to the Flame:
  • Flash Grenades Stun enemies that are facing towards the impact point for 5 seconds.
  • High-Voltage Shock Traps Stun enemies that comes over it for 8 seconds once armed.
• In Stationary Security Service, once the Aegirian Oscilloscope is upgraded with Ambush Circuit Chip, enemies blocked by Abyssal Hunters Operators will be Stunned as long as the Oscilloscope is present.

Operators

Against enemiesAgainst friendly units

Operator	Source	Target	Duration
	Drug Cocktail Administration	Randomly on attack	Base: 0.6 seconds Elite 1: 0.8 seconds Elite 2: 1 second GEE-X Stage 2: 1.1 seconds GEE-X Stage 3: 1.2 seconds
	Precise Strike	Attack against enemies outside the normal attack range with a 25% (+3% P5) chance	2 seconds
	Auxiliary Equipment	Within attack range when deployed, AoE	Elite 1: 3 seconds Elite 2: 4 seconds
	Guardian Obelisk	Sand Obelisk deployment 　□□□　 　□■□　 　□□□	Level 1-6: 1 second Level 7: 1.5 seconds Spec. 1: 2 seconds Spec. 2: 2.5 seconds Spec. 3: 3 seconds
	Blade Swap	Up to 5 enemies within range 　□□　　　 　■□□□　 　□□	Level 1-3: 0.8 seconds Level 4-6: 1 second Level 7: 1.2 seconds Spec. 1: 1.4 seconds Spec. 2: 1.6 seconds Spec. 3: 1.8 seconds
	Flash Shield	□□　 　■□□　 　　□□	Level 1-3: 2.5 seconds Level 4-6: 3 seconds Level 7: 3.5 seconds Spec. 1: 3.8 seconds Spec. 2: 4.1 seconds Spec. 3: 4.5 seconds
	Shield Bash	Blocked enemies	Level 1-6: 5 seconds Level 7-Spec. 2: 6 seconds Spec. 3: 7 seconds
	Sheathed Strike	Attack when charged	Level 1-3: 1 second Level 4-6: 1.25 seconds Level 7-Spec. 3: 1.5 seconds
	Chi Xiao - Shadowless	Last hit 　　□　　 　□□□　 □□■□□ 　□□□　 　　□	Level 1-3: 2 seconds Level 4-6: 2.5 seconds Level 7-Spec. 2: 3 seconds Spec. 3: 4 seconds
	Synchronized Attack	Attack (both Click herself and her Drone) with a chance listed below while active Level 1-3: 20% Level 4-7: 23% Spec. 1-3: 27% 　□□□□　 　■□□□　 　□□□□	Level 1-6: 0.4 seconds Level 7-Spec. 2: 0.7 seconds Spec. 3: 1 second
	Binding Chains	Up to 2 (L1-7)/3 (Sp1-3) enemies within range 　　□□□　 　■□□□　 　　□□□	Level 1-7: 1.5 seconds Spec. 1: 2 seconds Spec. 2: 2.5 seconds Spec. 3: 3 seconds
	Magnetic Hammer	□　　 　□■□　 　　□	Level 1-3: 2.5 seconds Level 4-6: 3 seconds Level 7-Spec. 2: 3.5 seconds Spec. 3: 4 seconds
	Shock Defense	Enemies affected by a GRZMOT Mine	Level 1-7: 4 seconds Spec. 1-3: 5 seconds
	Deterring Shot	Shifted enemies if they comes in contact with a high tile	Level 1: 1.2 seconds Level 2: 1.3 seconds Level 3-4: 1.4 seconds Level 5: 1.5 seconds Level 6: 1.6 seconds Level 7: 1.7 seconds Spec. 1: 1.8 seconds Spec. 2: 1.9 seconds Spec. 3: 2 seconds
	Staggering Shot	Shifted enemies (extended upon coming into contact with a high tile) and others coming into contact with them 　■□□	Level 1: 1.6 (2.7) seconds Level 2: 1.7 (2.8) seconds Level 3: 1.8 (2.9) seconds Level 4: 1.9 (3) seconds Level 5: 2 (3.1) seconds Level 6: 2.1 (3.2) seconds Level 7: 2.2 (3.4) seconds Spec. 1: 2.3 (3.6) seconds Spec. 2: 2.4 (3.8) seconds Spec. 3: 2.5 (4) seconds
	Menacing Slash	Enemies blocked by Eunectes	Until the skill expires
	"Pinus Sylvestris"	□　　 　□□□　 □□■□□ 　□□□　 　　□	0.5 seconds ×2
	Trap Deployment	The enemy that triggers a Welcome Mat	Level 1-7: 1 second Spec. 1-2: 1.2 seconds Spec. 3: 1.5 seconds
	Counter EMP	Only applies to Drones 　　　□　　　 　　□□□　　 　□□□□□　 □□□■□□□ 　□□□□□　 　　□□□　　 　　　□	Level 1-3: 3.5 seconds Level 4-6: 4 second Level 7: 4.5 seconds Spec. 1: 5 seconds Spec. 2: 5.5 seconds Spec. 3: 6 seconds
	Frying Pan Specialist	Attack with a chance listed below Elite 1: 10% Elite 2: 15% GUA-X Stage 2: 20% GUA-X Stage 3: 23%	Elite 1: 0.5 seconds Elite 2: 1 second GUA-X Stage 2+: 1.5 seconds
	Burden of Cinder and Ash	Attack in the alternate stance	1 second
	Fog of War Upon Death's Door	Attack with a 25% chance while active	2 seconds
	Saturation Burst	Enemies caught in the shell's blast (radius 1.7)	Level 1-7: 5 seconds Spec. 1-2: 5.5 seconds Spec. 3: 6 seconds
	Non-Damaging Restructuring	When Mon3tr is defeated (not retreated) 　□□□　 　□■□　 　□□□
	Bullseye	Attack with a chance listed below Elite 1: 10% Elite 2: 20%	0.2 seconds
	Preparedness Averts Peril	The enemy that Stuns/Freezes Lee while in effect	3 seconds
	Foolproof Plan	Crystal Barrier shatter, all enemies within attack range	1 second
	Counter Arc	Attack with a chance listed below on while active, hits up to 3 (L1-Sp2)/4 (Sp3) targets Level 1-3: 10% chance Level 4-6: 15% chance Level 7-Spec. 2: 20% chance Spec. 3: 25% chance	3 seconds
	Toxic Overload	Attack while active	Level 1-3: 0.5 seconds Level 4-6: 0.6 seconds Level 7: 0.7 seconds Spec. 1: 0.8 seconds Spec. 2: 0.9 seconds Spec. 3: 1 second
	Binding Shock	Attack with a 30% chance while active	Level 1-3: 0.9 seconds Level 4-7: 1 second Spec. 1-2: 1.1 seconds Spec. 3: 1.2 seconds
	Moon in the Water	Attack while active □□□　　 □□□□　 □■□□□ □□□□　 □□□	Level 1-3: 0.9 seconds Level 4-7: 1 second Spec. 1-2: 1.1 seconds Spec. 3: 1.2 seconds
	Lock of Shattered Time	Enemies within attack range	Level 1-3: 4 seconds Level 4-6: 5 seconds Level 7-Spec. 2: 6 seconds Spec. 3: 7 seconds
	Unexpected Strike	Attack after not attacking for 4 seconds (E1)/3 seconds (MER-X Stage 3)	Elite 1: 3 seconds Elite 2: 4 seconds MER-X Stage 2: 5 seconds
	Crag Splitter	Attack with a 30% chance when charged 　□□□　 　□■□　 　□□□	Level 1-3: 0.4 seconds Level 4-6: 0.5 seconds Level 7: 0.6 seconds Spec. 1: 0.8 seconds Spec. 2: 1 second Spec. 3: 1.2 seconds
	Bloodline of Desecrated Earth	□　　 　□□□　 □□■□□ 　□□□　 　　□	After the first phase ends Level 1-6: 3 seconds Level 7: 3.5 seconds Spec. 1: 4 seconds Spec. 2: 4.5 seconds Spec. 3: 5 seconds
	Superficial Regulation	Enemies blocked by the Flowing Shape after it copies a melee Operator	Until the skill expires
	Blazing Sun's Obeisance	Blazing Sun deployment 　　□　　 　□■□　 　　□	3 seconds
	Brave the Darkness	When deployed 　　□　　 　□■□　 　　□	Elite 1: 2 seconds Elite 2: 3 seconds
	Last Word	Attack when Overcharged	Level 1-7: 3 seconds Spec. 1-2: 4 seconds Spec. 3: 5 seconds
	Shock of Time	Attack while active; lasts longer on the primary target	Level 1-6: 1/0.8 seconds Level 7-Spec. 3: 1.5/0.8 seconds
	Night Raid	Randomly when deployed 　□□□　 　□■□　 　□□□	Level 1-3: 2 seconds Level 4-6: 2.5 seconds Level 7: 3 seconds Spec. 1: 3.5 seconds Spec. 2: 4 seconds Spec. 3: 4.5 seconds
	Wolfpack	When deployed 　　□　　 　□■□　 　　□	Level 1-3: 1 seconds Level 4-6: 1.5 seconds Level 7: 2 seconds Spec. 1: 2.3 seconds Spec. 2: 2.6 seconds Spec. 3: 3 seconds
	All-Out Clash	Attack with a 25% chance while active	2 seconds
	Nociceptor Inhibition	Attack with a 20% chance while active	Level 1-3: 0.7 seconds Level 4-6: 0.9 seconds Level 7: 1.1 seconds Spec. 1: 1.2 seconds Spec. 2: 1.3 seconds Spec. 3: 1.5 seconds
	"As You Wish"	Rosmontis's Tactical Equipment deployment 　□□□　 　□■□　 　□□□	Level 1-3: 1.5 seconds Level 4-6: 2 seconds Level 7-Spec. 2: 2.5 seconds Spec. 3: 3 seconds
	Skull Breaker	Attack with a 40% chance while active	Level 1-3: 0.5 seconds Level 4-6: 0.8 seconds Level 7: 1.1 seconds Spec. 1: 1.2 seconds Spec. 2: 1.3 seconds Spec. 3: 1.5 seconds
	Fire of Heaven	Attack while active	Level 1-3: 0.1 seconds Level 4-6: 0.15 seconds Level 7: 0.2 seconds Spec. 1: 0.4 seconds Spec. 2: 0.6 seconds Spec. 3: 1 second
	Differential Reloading Experiment	Randomly on attack	Base: 30% chance, 0.5 seconds Elite 1: 50% chance, 1 second Elite 2: 70% chance, 1 second
	Felyne Lottery Bomb	Randomly on attack unless when the talent is disabled	P0-P2: 0.1 seconds P3-P6: 0.2 seconds
	Sword Rain	Inflicted twice 　　□　　 　□□□　 □□■□□ 　□□□　 　　□	Level 1-7: 2 seconds Spec. 1-3: 3 seconds
	Torrential Sword Rain	All enemies for the main attack and up to 2 (L1-6)/3 (L7-Sp3) enemies within range (inflicted every second) while active 　□□□　 　□■□　 　□□□	Level 1-6: 2/0.2 seconds Level 7-Spec. 3: 3/0.2 seconds Spec. 3: 4/0.2 seconds
	Gavial's Protection Plan	Randomly on attack with a chance listed below while active Level 1-3: 50% Level 4-6: 60% Level 7: 70% Spec. 1: 80% Spec. 2: 90% Spec. 3: 100% 　　□　　　 　　■□　　 　　□	Level 1-3: 0.6 seconds Level 4-6: 0.8 seconds Level 7-Spec. 2: 1.2 seconds Spec. 3: 1.6 seconds
	Order of the Icefield	Attack with a 40% chance while active	1 second
	"Eternal Hunt"	Arrow barrage, hits random targets 4 (L1-7)/5 (Sp1-3) times 　□□□　 　□■□　 　□□□	0.4 seconds
	Paths Must Be Opened	Enemies near the anchor when it lands (radius 1.8)	6 seconds
	King of Heart	Within attack range, radius 1.2	Level 1-3: 1.5 seconds Level 4-6: 1.8 seconds Level 7: 2.1 seconds Spec. 1: 2.4 seconds Spec. 2: 2.7 seconds Spec. 3: 3 seconds
	Jack in the Box	Front Toward Enemy detonation, radius 1.5	Level 1-3: 1.4 seconds Level 4-6: 1.6 seconds Level 7-Spec. 1: 1.8 seconds Spec. 2: 2 seconds Spec. 3: 2.2 seconds
	D12	Up to 3 (L1-7)/4 (Sp1-3) enemies within attack range, radius 1.2	Level 1-3: 3 seconds Level 4-6: 3.5 seconds Level 7-Spec. 1: 4 seconds Spec. 2: 4.5 seconds Spec. 3: 5 seconds
	Barrel Burst	Attack when charged	Level 1-6: 0.8 seconds Level 7: 0.9 seconds Spec. 1: 1 second Spec. 2: 1.1 seconds Spec. 3: 1.2 seconds
	Longing for Home	When unleashed	1 second
	Souvenir	Afterimage explosion	Elite 1: 0.5 seconds Elite 2: 1 second
	Localized Liquidation	Attack (including aftershocks) when charged	Level 1-6: 0.5 seconds Level 7-Spec. 2: 1 second Spec. 3: 1.5 seconds
	Blessings Unto Yan	Last slash	Level 1-3: 3 seconds Level 4-6: 3.5 seconds Level 7-Spec. 1: 4 seconds Spec. 2-3: 5 seconds

Operator	Source	Target	Duration
	Spirit Burst	Self	10 seconds after Spirit Burst expires
	Homeland Protector		5 seconds after Homeland Protector expires
	High-Voltage Current		After the skill expires Level 1-3: 8 seconds Level 4-6: 7 seconds Level 7-Spec. 2: 6 seconds Spec. 3: 5 seconds
	Earthen Tenacity
	Genesis	Self and friendly units within effect radius if Genesis fails (50% chance) 　　□　　 　□□□　 □□■□□ 　□□□　 　　□	5 seconds
	Safe Landing	Self	10 seconds after deployment
	Focus Overload		10 seconds after Focus Overload expires
	Iron Will		5 seconds after Iron Will expires
	Destiny		After Destiny expires Level 1-3: 15 seconds Level 4-6: 14 seconds Level 7: 13 seconds Spec. 1: 12 seconds Spec. 2: 11 seconds Spec. 3: 10 seconds
	Counter Arc		5 seconds after Counter Arc expires
	Willing Burden		Overload duration (unless if the skill is deactivated before Overloaded)
	Panoramic Overload	All deployed Mobile Buggy Cams	5 seconds after Panoramic Overload expires
	Bone Fracture	Self	10 seconds after Bone Fracture expires
	On-the-Fly Weapon Modding	Self and the affected Sniper when attacking with a chance listed below Level 1-3: 35% Level 4-6: 30% Level 7-Spec. 2: 25% Spec. 3: 20%	Level 1-3: 3 seconds Level 4-6: 2.5 seconds Level 7-Spec. 1: 2 seconds Spec. 2: 1.8 seconds Spec. 3: 1.5 seconds

Hostile

• When Nervous Impairment explodes, the victim will be Stunned for 10 seconds.
• When a friendly Gelato Stop's HP reaches 0, friendly units in its range will be Stunned for 5 seconds.
• In Stationary Security Service:
  • If a deployed Contaminated Mineral is not destroyed in time, it will explode, Stunning friendly units caught in its blast for 5 seconds.
  • Whenever a Heat Cluster is transferred to the Deployment Waiting Zone, all friendly units will be Stunned for 5 seconds.
  • Whenever a Shoddy Flashbang is transferred to the Deployment Waiting Zone, all friendly units on ranged tiles will be Stunned for 8 seconds.

Enemy

Enemy	Method	Duration
	Leash attack	Up to 20 seconds
	Every third attacks	7 seconds
	Every fourth attacks
	Every third attacks	5 seconds
		15 seconds
	Explosion when HP reaches 0 in the First Form (radius 3)	Level 0: 16 seconds Level 1: 25 seconds
	Boulder attack (range 2.5, 13 seconds cooldown; will never be used against Stunned friendlies unless if no other targets are available)	25 seconds
	Every fourth attacks (up to 2 targets)	3 seconds
	Exsanguination (global range, 10/15 seconds cooldown)	10 seconds
	Crimson Formation (attached onto the target in each attack)	10 seconds or until the Formation is destroyed
	Melee attack (radius 0.8/1.2 [Second Form])	6 seconds
	Every fourth attacks; will never target Stunned friendlies unless if no other targets are available	20 seconds
	Interference attack, inflicted every 5 seconds (3×3 area)	3 seconds
	Overload attacks	2 seconds each
	Trap trigger	10 seconds
	Shattered Vision on the Second Form; only affects units on ranged tiles	(15 ÷ no. of affected units) seconds
	Attack	4 seconds
	Explosion when the power armor is destroyed (radius 1.5)	10 seconds
	Every third attacks	15 seconds
	Surge of Nature (40/60 seconds cooldown)	10 seconds
	Quickdraw (First Form; 15/30 seconds cooldown) Stroke of Thunder (replaces Quickdraw in the Second Form; 15/30 seconds cooldown which is refreshed if the target leaves the map amidst the attack)	6 seconds
	AoE attack every fourth attacks	4 seconds
	Blood Surge (when defeated in the First Form and after using Sunken Death on the Second Form)	5 seconds
	Attack while the melancholic variation is in effect	10 seconds
	Every third attacks	9 seconds
	Can attack (affects the target and others in the adjacent tiles)	6 seconds
	While on top of a friendly unit	Until the Aged Mead leaves the map
	Conquest/Edict (targets each other or friendly units if either is absent, affects both friendly units and enemies; 10/30 seconds cooldown)	10 seconds
	Every third attacks (radius 1.5)	8 seconds
	Annihilation attack	3 seconds
	Straight Shot	5 seconds
	Attack while having charges for "Stand Down!" in the Second Form	6 seconds

Interactions

Friendlies

Operator	Subject	Interaction
	Assault Tactics	Ash's attacks while Assault Tactics is active deals more damage against Stunned enemies: Level 1: 150% Level 2: 160% Level 3: 170% Level 4: 180% Level 5: 180% Level 6: 200% Level 7: 210% Spec. 1: 220% Spec. 2: 230% Spec. 3: 250%
	Shielded Shooting	Blitz attacks Stunned enemies over the others and his ATK is increased against Stunned enemies, which is multiplied while Shield Bash is active. ATK increase Elite 1: 130% Elite 2: 160% Potential 5: +5% ATK buff multiplier Level 1-3: 1.2× Level 4-6: 1.3× Level 7: 1.4× Spec. 1-3: 1.5×
	Do or Die	The ATK increase is enhanced when Hoederer attacks Stunned enemies. Elite 1: 105% > 125% Elite 2: 110% > 140%
	Preparedness Averts Peril	The next DP drain instance drains 5 DP instead (unless there is not enough DP) to block the next Stun/Freeze received by Lee.
	Insult to Injury	Stunned enemies within W's attack range takes +18% (+3% Pot. 5) Physical damage.

Enemies

Enemy	Interaction
	Brand a mark on enemies Stunned during a Sovereign's Edict variation, which deals heavy Arts damage to them when it ends.

Enemies with Low-Altitude Hovering will lose it when Stunned for the first time, unless if they are immune to Stun themselves.

In Integrated Strategies, the Collectibles String Puppet and Children's Puppet (as well as "Renowned Singer" in Crimson Solitaire) cause Stunned enemies to periodically receive Arts damage.

Trivia

• There are actually two flags in the game for the Stun status effect. The one in use in majority is the traditional "STUNNED" flag. There exists, however, an unused "STUNNED_NO_AMPLIFY_DAMAGE" flag which has the effect of traditional stun but does not apply the aforementioned damage amplifications in the Interactions section.
• In most characters who have both friendly and enemy versions (e.g. Guerrilla Shieldguard, Mudrock), the former has a unique Stunned animation, while the latter does not.
• Unlike any other sources, Sarkaz Caster (Leader)'s leash ability also inflicts Stun, albeit lacking the "dizzy" effect on the target.