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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.
A debuff that reveals its victim to the enemies may cause other wards and stealthed units near the victim to be reveal as well. Currentlyand works 100% of the time. and have unconfirmed effects for the first, while the latter being less consistent.
|Deals damage and restoresenergy when consumed||6 seconds||N/A|
|Reduces magic resist by 15/25/35 when autoattacked by||3 seconds||N/A|
|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|
|Enemies affected by these abilities are slowed and take increased damage from||6 seconds|
|Enemies affected suffer additional effects fromabilities and receive magic damage equal to 2% of their maximum health over 4 seconds||4 seconds||Every one ofabilities apply this debuff.|
|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.|
|Enemies affected are poisoned, taking Damage over time and reducing the cooldown of to 0.5 seconds when targetted.||2-3 seconds|
|Enemies hit will take magic damage and revealed for a duration.||6 seconds||N/A|
|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|
|Applies a stacking DoT on autoattacks and skills. Enhances certain abilities.||5 seconds||Stacks 5 times. Reduces cooldown ofby 1 second per stack on target. Increases damage done by per stack.|
|Reveals targets afflicted with Moonlight andcooldown is refreshed if used on target.||3 second||All active Moonlight debuffs are consumed whenis casted.|
|Critical Strikes and apply a physical DoT.||4 seconds|
|Nearby enemy units have their magic resist reduced by 10.|
|Upon activation, deal bonus magic damage on hit and inflicts Grievous Wounds for a duration.||5 seconds|
|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|
|Enemies who are dealt magic damage will also receive an attack speed debuff of 20/25/30/35/40 %||3 seconds||N/A|
|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|
|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|
|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|
|Any enemy who passes through the wall suffer reduced Magic Resistance by 15% and are slowed by 40/50/60/70/80%||5 seconds|
|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.|
|Deals damage when consumed||5 seconds|
|Applies Grievous Wounds on hit.|
|Every autoattack will apply a debuff that reduces target's armor and magic resist by 3%.||5 seconds||Stacks up to 5 stacks.|
|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.|
|Stuns affected enemies for 1 second and restoresenergy by 25 upon reaching 3 stacks. Stun duration is halved if applied more than once in a 7 second period.||8 seconds|
|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|
|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|
|Deals magic damage and marks the target. Ifdamages them with another spell, they will take additional magic damage and be silenced for 2 seconds.||3.5 seconds|
|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|
|Deals magic damage to a target and reveals them. Enemies affected by this debuff will be targetted bywhen activated.||3 seconds|
|Deals magic damage to all nearby enemies and reveals them. Enemies affected by this debuff will also be affected bywhen activated.||4 seconds|
|Cripples all enemies revealed byreducing their movement and attack speed. The movement and attack speed recover over 4 seconds.||4 seconds||Effect will only apply to those marked by.|
|Whenallies 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 ofspells.|
|When autoattacked by Finales Funkeln, she consumes the Illumination debuff to deal additional 10 + (10xlevel) magic damage.or hit by||3.5 seconds||Applied by all ofdamaging spells, including (after consumed).|
|Reduces attack speed of all enemies hit by 30/35/40/45/50%||3 seconds||N/A|
|If the target dies with this debuff, Malefic Visions will affect another nearby unit while restoring 10/14/18/22/26 mana to .||4 seconds||Duration is refreshed when it affects another target.|
|Healing effects and health regeneration on this target are halved for the duration of the debuff.||3 seconds||N/A|
|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.|
|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.|
|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%.|
|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.|
|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|
|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.|
|Bushwack reveals enemies who trigger it and reduces their armor and magic resistance by 20/25/30/35/40%.||12 seconds||N/A|
|Targets leave a Dusk Trail along their paths, revealing their movements. While on this Dusk Trail,ignores unit collision and gains 15/20/25/30/35% Movement Speed and 15/25/35/45/55 Attack Damage.||5 seconds|
|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|
|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|
|Ice Blast slows targets movement speed by a percentage and attack speed by 25%.||3 seconds||N/A|
|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.|
|Debuffed enemies take 20/30/40% increased damage from.||6 / 7 / 8 seconds||For the duration of the debuff, Cleansing this debuff will make invulnerable for the duration.can only be damaged by debuffed units. This effect ends prematurely if the target dies.|
|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|
|Reduces armor of all enemies hit byby 15/17.5/20/22.5/25%||4 seconds||Only when empowered by Fury.|
|Reduces the targets' magic resistance by 12/15/18/21/24 per hit.||5 seconds||N/A|
|Slows enemies by 10% and will be targetted bywhen activated||3 seconds||Applied through autoattacks,and|
|Non-champion units affected have a 20/22.5/25/27.5/30% chance to miss their autoattacks||2 seconds||N/A|
|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|
|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|
|Poisons enemies, dealing damage over time and reducing the cooldown ofto 0.5 seconds if hit by it.||3 seconds||Continual exposure renews the poison.|
|If Skarner attacks enemies hit by Fracture, he restores health. The heal becomes less potent with every mark he consumes.||6 seconds||N/A|
|Ifwas cast last prior to using , the target deals 20% reduced damage.||4 seconds||N/A|
|Reduces the targets' magic resistance by 8/9/10/11/12. This effect stacks up to 10 times.||5 seconds||N/A|
|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|
|Deals physical damage over time and reveals the marked champion||6 seconds||Only affects Champions|
|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|
|Reduces the armor of enemies hit by 10/15/20/25/30||4 seconds||N/A|
|Poisons all enemies hit, dealing damage over time and reducing the cooldown ofto 0.5 seconds if targetted||4 seconds||N/A|
|Deals magic damage over time and reduces the potency of healing effects and health regeneration on the target by 50%||5 seconds||N/A|
|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.|
|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.|
|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%.|
|Reveals position to the enemy team, including champions in stealth.||6/8/10 seconds|
|Deals damage over time, and whenis activated, it deals additional damage per stack.||6 seconds||May stack up to 6 times.|
|Reduces damage dealt by affected units by 15%||2.5 seconds||Applied by Urgot's autoattacks and|
|Reduces armor of affected units by 12/14/16/18/20% and allows lock-on targetting with||5 seconds|
|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. Stacks are lost upon switching targets.|
|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.|
|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%|
|Affected enemies take 12% amplified damage from all sources. At the end of the debuff, they take magic damage.||5 seconds|
|Takes additional magic damage from Warwick's autoattacks, while healing him for the same amount. This effect stacks up to 3 times.||4 seconds|
|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.|
|Reduces armor of enemies hit by 30%||3 seconds|
|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.|
|If hit by another one of Xerath's spells, the target is stunned by 1.5 seconds||3 seconds|
|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 Time Bomb before the first has finished counting down will detonate the first bomb prematurely, while refreshing the duration.|
Summoner spells have greater effect as a debuff as compared to champion abilities.
- Exhaust reduces the damage dealt from the affected champion and slow it greatly.
- Ignite deals true damage over 5 seconds, and reducing all healing and regeneration effects on the affected target for the duration.
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.
These items does not have a passive effect of debuffing enemy on its own, but possesses an active component that will debuff enemy.
- active effect will deal magic damage and slow its target's movement speed by 50% for 3 seconds.
- active effect will deal magic damage and slow its target's movement speed by 50% for 3 seconds.
Items such as the following will debuffs enemies automatically when they comes into range. No activation is required to bring the effect into place.
- magic resist by 20. passively reduces all nearby enemy champions'
- attack speed by 20%. passively slows all nearby enemies'
- passively allows auto-attacks to slow your target's Movement Speed by 40% for 2.5 seconds. (30% for ranged attacks)
- magic resistance by 6 for 8 seconds. Stacks up to 4 times. inflict 20 magic damage on-hit and reduces the target's
- Movement Speed by 30% for 2.5 seconds. gives auto-attacks 25% chance to slow the target's
- passively causes your spell damage to additionally slows the target by 15% or 35% for 1.5 seconds.
- allow auto-attacks to reduce your target's armor by 15 for 5 seconds. Stacks up to 3 times.
- allows auto-attacks to have a 25% chance to slow your target's movement speed by 35% for 2.5 seconds.
- 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.
These are items with both a passive and active component that both debuffs the enemy.
- 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.
- 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.