A debuff is the inverse of a buff. It is an effect that hampers the target in some way for a duration. Among other effects, debuffs usually lower attributes, hinder the effectiveness of the target's actions, or cause damage over time.

Similarly with buff, certain debuff are stackable: repeated application on the same target will causes a stacking effect of increased effectiveness. Non-stackable debuffwill only be refreshed by repeated application. All debuffs are temporary, and will not persist after the affected target's death.

There are currently 3 sources of debuffs: champion abilities, summoner spells, and item active effects.

Champion Abilities 编辑

Majority of the champions possesses a certain type of debuff. Such debuff can be armor reduction from Wukong 孙悟空Crushing Blow Crushing Blow, magic resist reduction from Fiddlesticks 费德提克Dread.png Dread, or attack damage reduction from Trundle 特朗德尔Rabid Bite Rabid Bite.

A debuff that reveals its victim to the enemies may cause other wards and stealthed units near the victim to be reveal as well. Currently Nidalee 奈德丽Bushwhack.png Bushwhack and Caitlyn 凯特琳YordleSnapTrap.png Yordle Snap Trap works 100% of the time. Corki 库奇Phosphorous Bomb Phosphorous Bomb and Lulu 璐璐Help,Pix!.png Help, Pix! have unconfirmed effects for the first, while the latter being less consistent.

Damage over time, and Direct CC such as Amumu 阿木木BandageToss.png Bandage Toss will not be included. Crowd control, which is also a form of debuff by default and covered by crowd control section.

Champion Ability Effect Duration Notes
Akali Akali MarkoftheAssassin.png Mark of the Assassin Deals damage and restores Akali Akali's energy when consumed 6 seconds N/A
Amumu Amumu CursedTouch.png Cursed Touch Reduces magic resist by 15/25/35 when autoattacked by Amumu Amumu 3 seconds N/A
Anivia Anivia Rebirth.png Rebirth Reduces Anivia's armor and magic resist by 40/25/10 during her Rebirth 6 seconds Gains armor and magic resist instead at higher levels
Flash Frost Flash Frost
Glacial Storm Glacial Storm
Enemies affected by these abilities are slowed and take increased damage from Frostbite.png Frostbite 6 seconds
Brand Brand Blaze.png Blaze Enemies affected suffer additional effects from Brand Brand's abilities and receive magic damage equal to 2% of their maximum health over 4 seconds 4 seconds Every one of Brand Brand's abilities apply this debuff.
Caitlyn Caitlyn YordleSnapTrap.png Yordle Snap Trap Enemy champions who activate this trap are revealed for 9 seconds, take magic damage and are snared for 1.5 seconds. 9 seconds Only champions can activate the trap.
Cassiopeia Cassiopeia NoxiousBlast.png Noxious Blast
Miasma.png Miasma
Enemies affected are poisoned, taking Damage over time and reducing the cooldown of TwinFang.png Twin Fang to 0.5 seconds when targetted. 2-3 seconds
Corki Corki Phosphorus Bomb Phosphorus Bomb Enemies hit will take magic damage and revealed for a duration. 6 seconds N/A
Gatling Gun Gatling Gun Enemies within the area will take physical damage and receive a armor debuff of 1/2/3/4/5 per half a second for up to 4 seconds. 2 seconds Stacks up to 9 stacks
Darius Darius 出血.png Hemorrhage Applies a stacking DoT on autoattacks and skills. Enhances certain abilities. 5 seconds Stacks 5 times. Reduces cooldown of CripplingStrike.png Crippling Strike by 1 second per stack on target. Increases damage done by 诺克萨斯断头台.png Noxian Guillotine per stack.
Diana Diana 新月打击.png Crescent Strike Reveals targets afflicted with Moonlight and 月神冲刺.png Lunar Rush's cooldown is refreshed if used on target. 3 second All active Moonlight debuffs are consumed when 月神冲刺.png Lunar Rush is casted.
Draven Draven WickedBlades.png Wicked Blades SpinningAxe.png Spinning Axe Critical Strikes and SpinningAxe.png Spinning Axe apply a physical DoT. 4 seconds
Fiddlesticks Fiddlesticks Dread.png Dread Nearby enemy units have their magic resist reduced by 10.
Fizz Fizz Seastone Trident Seastone Trident Upon activation, deal bonus magic damage on hit and inflicts Grievous Wounds for a duration. 5 seconds
Chum the Waters Chum the Waters Enemies affected are slowed and a shark will deal magic damage and knock them in the air, along with all surrounding enemies when the debuff expires. Up to 1.5 seconds
Gragas Gragas Barrel Roll Barrel Roll Enemies who are dealt magic damage will also receive an attack speed debuff of 20/25/30/35/40 % 3 seconds N/A
Graves Graves Smokescreen Smokescreen Deals magic damage to enemies in the area, and creates a smokescreen which reduces enemy sight range by 625 range within the affected area as long as they stay within the area. 4 seconds N/A
Heimerdinger Heimerdinger H-28GEvolutionTurret.png H-28G Evolution Turret From Rank 2 onwards, Turret's damage will apply an armor and magic resist reduction of 1 per stack. 2 seconds Stacks up to 50 stacks
20px Jarvan IV DragonStrike.png Dragon Strike Deals physical damage to enemies in a line, and apply an armor debuff which reduces armor by 10/14/18/22/26 % for a duration. 3 seconds
Karthus Karthus WallofPain.png Wall of Pain Any enemy who passes through the wall suffer reduced Magic Resistance by 15% and are slowed by 40/50/60/70/80% 5 seconds
Kassadin Kassadin Riftwalk.png Riftwalk Upon casting Riftwalk, additional casts within a period cost 100 more mana up to a maximum of 1000 additional mana. 8 seconds Riftwalk damage is also increased.
Katarina Katarina Bouncing Blade Bouncing Blade Deals damage when consumed 5 seconds
DeathLotus.png Death Lotus Applies Grievous Wounds on hit.
Kayle Kayle HolyFervor.png Holy Fervor Every autoattack will apply a debuff that reduces target's armor and magic resist by 3%. 5 seconds Stacks up to 5 stacks.
Reckoning.png Reckoning Blast a target with magic damage, slowing it and increases the damage that target receive from Kayle by 6/7/8/9/10 %. 4 seconds Debuff also slows for 35% at all level.
Kennen Kennen Mark of the Storm Mark of the Storm Stuns affected enemies for 1 second and restores Kennen Kennen's energy by 25 upon reaching 3 stacks. Stun duration is halved if applied more than once in a 7 second period. 8 seconds
20px Kog'Maw CausticSpittle.png Caustic Spittle Kog'Maw launches a corrosive projectile at a single target which deals magic damage and reduces its armor and magic resist by 5/10/15/20/25 and also leaves a trail behind the person that's hit. 4 seconds N/A
LivingArtillery.png Living Artillery Upon casting Living Artillery, additional casts of Living Artillery will cost 40 additional mana per stack up to a maximum of 200 additional mana 4 seconds N/A
LeBlanc LeBlanc SigilofSilence.png Sigil of Silence Deals magic damage and marks the target. If LeBlanc LeBlanc damages them with another spell, they will take additional magic damage and be silenced for 2 seconds. 3.5 seconds
EtherealChains.png Ethereal Chains Deals magic damage and tethers an enemy, slowing their movements. If they remain in the tether for 2 seconds, they take additional magic damage and be snared for 1/1.3/1.6/1.9/2.2 seconds 2 seconds
Lee Sin Lee Sin SonicWave.png Sonic Wave Deals magic damage to a target and reveals them. Enemies affected by this debuff will be targetted by Resonating Strike Resonating Strike when activated. 3 seconds
Tempest.png Tempest Deals magic damage to all nearby enemies and reveals them. Enemies affected by this debuff will also be affected by Cripple.png Cripple when activated. 4 seconds
Cripple.png Cripple Cripples all enemies revealed by Tempest.png Tempest reducing their movement and attack speed. The movement and attack speed recover over 4 seconds. 4 seconds Effect will only apply to those marked by Tempest.png Tempest.
Leona Leona Sunlight.png Sunlight When Leona Leona's allies deal any damage to targets with Sunlight, they consume the Sunlight debuff to deal additional 20/35/50/65/80/95/110/125/140 magic damage. 3.5 seconds Applied by all of Leona Leona's spells.
Lux Lux Illumination.png Illumination When autoattacked by Lux Lux or hit by Finales Funkeln Finales Funkeln, she consumes the Illumination debuff to deal additional 10 + (10xlevel) magic damage. 3.5 seconds Applied by all of Lux Lux's damaging spells, including Finales Funkeln Finales Funkeln (after consumed).
Malphite Malphite Ground Slam Ground Slam Reduces attack speed of all enemies hit by 30/35/40/45/50% 3 seconds N/A
Malzahar Malzahar MaleficVisions.png Malefic Visions If the target dies with this debuff, MaleficVisions.png Malefic Visions will affect another nearby unit while restoring 10/14/18/22/26 mana to Malzahar Malzahar. 4 seconds Duration is refreshed when it affects another target.
Miss Fortune Miss Fortune ImpureShots.png Impure Shots Healing effects and health regeneration on this target are halved for the duration of the debuff. 3 seconds N/A
Mordekaiser Mordekaiser ChildrenoftheGrave.png Children of the Grave If the target dies while under the effect of the curse, their soul is enslaved and will follow Mordekaiser for 30 seconds. 10 seconds Mordekaiser heals himself for the damage dealt by this ability.
Morgana Morgana TormentedSoil.png Tormented Soil Enemy units who stand on Tormented Soil lose magic resistance 4/5/6/7/8 every second they are standing on the area. Stacks up to 5 times, also refreshing the duration.
SoulShackles.png Soul Shackles Enemy units who stay tethered for 3 seconds are then dealt magic damage and are stunned for 1.5 seconds 3 seconds During the duration of the debuff, targets are slowed by 20%.
Nasus Nasus Wither.png Wither Nasus Nasus ages his target, slowing their movement and attack speed by 35%. Additionally, they are reduced further to reach an extra 12/24/36/48/60% slow. 5 seconds If the duration is reduced by Tenacity, the extra slow will be applied faster for it to reach its maximum at the end of the duration.
Spirit Fire Spirit Fire Enemy units who stand on Spirit Fire lose 20/25/30/35/40 Armor. 1 seconds Staying in Spirit Fire will continually refresh the debuff
Nautilus Nautilus DepthCharge.png Depth Charge Depth Charge will travel between Nautilus and this target, dealing damage and knocking up all units in its path. When Depth Charge reaches the target, it consumes the debuff, dealing damage, knocking up the target and stunning for 1/1.5/2 seconds Varies Depth Charge will accelerate as it travels.
Nidalee Nidalee Bushwhack.png Bushwhack Bushwack reveals enemies who trigger it and reduces their armor and magic resistance by 20/25/30/35/40%. 12 seconds N/A
Nocturne Nocturne Duskbringer.png Duskbringer Targets leave a Dusk Trail along their paths, revealing their movements. While on this Dusk Trail, Nocturne Nocturne ignores unit collision and gains 15/20/25/30/35% Movement Speed and 15/25/35/45/55 Attack Damage. 5 seconds
UnspeakableHorror.png Unspeakable Horror Tethers nearby enemies to Nocturne. If they remain tethered for the duration of the debuff, they will be Feared for 1/1.25/1.5/1.75/2 seconds 2 seconds
Paranoia.png Paranoia Reduces the sight radius of all enemy champions by 300 and removes their ally vision; this includes champions, minions, wards, towers, and clairvoyance. 4 seconds
Nunu Nunu Ice Blast Ice Blast Ice Blast slows targets movement speed by a percentage and attack speed by 25%. 3 seconds N/A
Absolute Zero Absolute Zero Enemies in Absolute Zero's area while it is being channeled are slowed by 50% and have their attack speed reduced by 25%. 0.5 seconds Staying in the zone will refresh the debuff up to 3 seconds. It can be canceled early.
Poppy Poppy Diplomatic Immunity Diplomatic Immunity Debuffed enemies take 20/30/40% increased damage from Poppy Poppy. 6 / 7 / 8 seconds For the duration of the debuff, Poppy Poppy can only be damaged by debuffed units. This effect ends prematurely if the target dies. Cleanse.png Cleansing this debuff will make Poppy Poppy invulnerable for the duration.
Rammus Rammus PuncturingTaunt.png Puncturing Taunt Taunts a target enemy, reducing their armor by 10/15/20/25/30 and forcing them to attack Rammus for a few seconds. 1/1.5/2/2.5/3 seconds N/A
Renekton Renekton Slice and Dice Slice and Dice Reduces armor of all enemies hit by Dice Dice by 15/17.5/20/22.5/25% 4 seconds Only when empowered by Fury.
Ryze Ryze SpellFlux.png Spell Flux Reduces the targets' magic resistance by 12/15/18/21/24 per hit. 5 seconds N/A
Sejuani Sejuani Frost.png Frost Slows enemies by 10% and will be targetted by Permafrost.png Permafrost when activated 3 seconds Applied through autoattacks, Arctic Assault Arctic Assault and Glacial Prison Glacial Prison
Shaco Shaco Two-Shiv Poison Two-Shiv Poison Non-champion units affected have a 20/22.5/25/27.5/30% chance to miss their autoattacks 2 seconds N/A
Shen Shen VorpalBlade.png Vorpal Blade Throws a sword at an enemy, dealing magic damage. The enemy is life-tapped; allied champions that damage a life-tapped enemy are healed over 3 seconds, with the duration refreshed upon subsequent damaging. 5 seconds N/A
Shyvana Shyvana FlameBreath.png Flame Breath Enemies hit by the fireball have their armor reduced by 15% and take further magic damage equal to 15% of the ability damage when struck by Shyvana's autoattacks. 4 seconds
Singed Singed Poison Trail Poison Trail Poisons enemies, dealing damage over time and reducing the cooldown of TwinFang.png Twin Fang to 0.5 seconds if hit by it. 3 seconds Continual exposure renews the poison.
Skarner Skarner Fracture.png Fracture If Skarner attacks enemies hit by Fracture, he restores health. The heal becomes less potent with every mark he consumes. 6 seconds N/A
Sona Sona PowerChord.png Power Chord If AriaofPerseverance.png Aria of Perseverance was cast last prior to using PowerChord.png Power Chord, the target deals 20% reduced damage. 4 seconds N/A
Soraka Soraka Starcall.png Starcall Reduces the targets' magic resistance by 8/9/10/11/12. This effect stacks up to 10 times. 5 seconds N/A
Swain Swain Torment.png Torment Deals magic damage over time and causes any further damage dealt by Swain during this period to be increased by 8/11/14/17/20%. 4 seconds N/A
Talon Talon NoxianDiplomacy.png Noxian Diplomacy Deals physical damage over time and reveals the marked champion 6 seconds Only affects Champions
Cutthroat.png Cutthroat Silences enemy champion for 1 second and causes any further damage dealt by Talon to be amplified by 3/6/9/12/15% 3 seconds Only affects Champions
Taric Taric Shatter.png Shatter Reduces the armor of enemies hit by 10/15/20/25/30 4 seconds N/A
Teemo Teemo 毒性射击.png Toxic Shot
种蘑菇.png Noxious Trap
Poisons all enemies hit, dealing damage over time and reducing the cooldown of TwinFang.png Twin Fang to 0.5 seconds if targetted 4 seconds N/A
Tristana Tristana ExplosiveShot.png Explosive Shot Deals magic damage over time and reduces the potency of healing effects and health regeneration on the target by 50% 5 seconds N/A
Trundle Trundle Rabid Bite Rabid Bite Reduces the target's Attack Damage by 10/12.5/15/17.5/20 8 seconds Trundle gains double the Attack Damage reduction in bonus Attack Damage for the same duration.
Agony.png Agony Deals magic damage over time and reduces target's Armor and Magic Resist by 15/20/25%. Armor and Magic Resist reduction doubles over the duration of the debuff. 6 seconds Trundle heals for the damage dealt and receives bonus Armor and Magic Resist equal to the amount reduced.
Tryndamere Tryndamere Mocking Shout Mocking Shout Reduces the target's Attack Damage by 20/35/50/65/80 4 seconds Also slows enemies who are not facing Tryndamere by 30/37.5/45/52.5/60%.
20px Twisted Fate Destiny.png Destiny Reveals position to the enemy team, including champions in stealth. 6/8/10 seconds
Twitch Twitch DeadlyVenom.png Deadly Venom Deals damage over time, and when Expunge.png Expunge is activated, it deals additional damage per stack. 6 seconds May stack up to 6 times.
Urgot Urgot Zaun-Touched Bolt Augmenter Zaun-Touched Bolt Augmenter Reduces damage dealt by affected units by 15% 2.5 seconds Applied by Urgot's autoattacks and AcidHunter.png Acid Hunter
Noxian Corrosive Charge Noxian Corrosive Charge Reduces armor of affected units by 12/14/16/18/20% and allows lock-on targetting with AcidHunter.png Acid Hunter 5 seconds
Vayne Vayne SilverBolts.png Silver Bolts At three stacks, Silver Bolts is consumed to deal true damage based off the target's maximum health 3 seconds Applied by Vayne's autoattacks and Condemn.png Condemn. Stacks are lost upon switching targets.
Viktor Viktor Gravity Field Gravity Field Slows enemies 28/32/36/40/44% while building stacks for every 0.5 seconds they remain in the field. At three stacks, targets are stunned for 1.5 seconds.
Vladimir Vladimir TidesofBlood.png Tides of Blood Upon casting Tides of Blood, Vladimir gains an empowered stack, increasing the health cost of Tides of Blood by 25%, stacking up to 4 times to a maximum of twice the listed health cost. 10 seconds Self-healing and Regeneration is increased by 4/5/6/7/8% per stack and Tides of Blood base damage is increased by 25%
Hemoplague.png Hemoplague Affected enemies take 12% amplified damage from all sources. At the end of the debuff, they take magic damage. 5 seconds
Warwick Warwick Eternal Thirst Eternal Thirst Takes additional magic damage from Warwick's autoattacks, while healing him for the same amount. This effect stacks up to 3 times. 4 seconds
Blood Scent Blood Scent Reveals location to enemy team while hasting Warwick by 20/25/30/35/40% Constantly reapplied when at less than 50% health and within 1,500/2,300/3,100/3,900/4,700 distance units of Warwick.
Wukong Wukong Crushing Blow Crushing Blow Reduces armor of enemies hit by 30% 3 seconds
20px Xin Zhao Challenge.png Challenge Reducing armor by 15% when Xin Zhao lands basic attacks or Audacious Charge. 3 seconds Only one target can be challenged at a given time. Affected unit is unaffected by the knockback of CrescentSweep.png Crescent Sweep.
Xerath Xerath Mage Chains Mage Chains If hit by another one of Xerath's spells, the target is stunned by 1.5 seconds 3 seconds
Zilean Zilean TimeBomb.png Time Bomb At the end of this debuff, targetted enemies take magic damage. The target will take 3, 2, 1 additional true damage per second as it counts down. 4 seconds Applying a second TimeBomb.png Time Bomb before the first has finished counting down will detonate the first bomb prematurely, while refreshing the duration.

Summoner Spells 编辑

Summoner spells have greater effect as a debuff as compared to champion abilities.

  • Exhaust.png Exhaust reduces the damage dealt from the affected champion and slow it greatly.
  • Ignite.png Ignite deals true damage over 5 seconds, and reducing all healing and regeneration effects on the affected target for the duration.

Item Effects 编辑

Certain items possesses capability to debuff enemy. Some of it will not debuff enemy unless the active component was utilized, some will automatically do so when certain action was fulfilled (such as autoattack, casting spells etc), and some may possesses both components.

Active Items 编辑

These items does not have a passive effect of debuffing enemy on its own, but possesses an active component that will debuff enemy.

  • Bilgewater Cutlass item.png Bilgewater Cutlass active effect will deal magic damage and slow its target's movement speed by 50% for 3 seconds.
  • Hextech Gunblade item.png Hextech Gunblade active effect will deal magic damage and slow its target's movement speed by 50% for 3 seconds.

Passive Item 编辑

Items such as the following will debuffs enemies automatically when they comes into range. No activation is required to bring the effect into place.

  • Abyssal Scepter item.png Abyssal Scepter passively reduces all nearby enemy champions' magic resist by 20.
  • Frozen Heart item.png Frozen Heart passively slows all nearby enemies' attack speed by 20%.
  • Frozen Mallet item.png Frozen Mallet passively allows auto-attacks to slow your target's Movement Speed by 40% for 2.5 seconds. (30% for ranged attacks)
  • Item.png Malady inflict 20 magic damage on-hit and reduces the target's magic resistance by 6 for 8 seconds. Stacks up to 4 times.
  • Item.png Phage gives auto-attacks 25% chance to slow the target's Movement Speed by 30% for 2.5 seconds.
  • Rylai's Crystal Scepter item.png Rylai's Crystal Scepter passively causes your spell damage to additionally slows the target by 15% or 35% for 1.5 seconds.
  • Black Cleaver item.png The Black Cleaver allow auto-attacks to reduce your target's armor by 15 for 5 seconds. Stacks up to 3 times.
  • Trinity Force item.png Trinity Force allows auto-attacks to have a 25% chance to slow your target's movement speed by 35% for 2.5 seconds.
  • Warden's Mail item.png Warden's Mail causes user to have 20% chance on being hit by an auto-attack to reduce attacker's movement speed and attack speed by 35% for 3 seconds.

Items with both components 编辑

These are items with both a passive and active component that both debuffs the enemy.

  • Executioner's Calling item.png Executioner's Calling inflict 4 damage per second on-hit for 8 seconds. Upon activation, auto-attacks temporarily apply Grievous Wound which reduces healing and regeneration effects by 50% for 8 seconds.
  • Randuin's Omen item.png Randuin's Omen grants the wielder 20% chance on being hit by an auto attack to slow the attacker's movement and attack speed by 35% for 3 seconds. Upon activation of its active component, it will slows movement speed and attack speed of surrounding enemy units by 35% for 2 seconds + 0.5 seconds for every 100 armor and magic resistance.
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