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The Mouth of the Abyss
Release Date:June 24, 2010
Cost:4800 BE
880 RP
Health Regen HealthRegen Mini Icon.png :517.76 (+ 0.55)
Mana Mana Mini Icon.png :322.2 (+ 40)
Mana Regen ManaRegen Mini Icon.png :8.675 (+ 0.7)
Movespeed MovementSpeed Mini Icon.png :325
Attack Damage AttackDamage Mini Icon.png :57.46 (+ 2.41)
Attack Speed AttackSpeed Mini Icon.png :0.625 (+ 3.5%)
Range Range Mini Icon.png :500
Armor Armor Mini Icon.png :19.88 (+ 3.5)
Magic Resist MagicResist Mini Icon.png :30 (+ 0)


When the prophet  Malzahar was reborn in Icathia, he was led there by an ominous voice which thereafter anchored itself to his psyche. From within, this voice bestowed upon him terrible purpose, and though Malzahar was no longer tormented by its call, the voice did not cease its unrelenting summons. This baleful beacon's gentle flicker - now fastened to Runeterra - drew forth a putrid beast that ambled across a threshold it did not understand, widening a fissure between the spaces which were never meant to meet. There amongst the haunting ruins of Icathia, Kog'Maw manifested in Valoran with unsettling curiosity. The spark which led him to Runeterra teased him still, urging him gently towards Malzahar. It also encouraged him to familiarize himself with his new environment, to the stark horror of everything he encountered on his journey.

The enchanting colors and aromas of Runeterra intoxicated Kog'Maw, and he explored the fruits of the strange world the only way he knew how: by devouring them. At first he sampled only the wild flora and fauna he happened across. As he traversed the parched Tempest Flats, however, he came upon a tribe of nomads. Seemingly unhampered by conventional rules of physics, Kog'Maw consumed every nomad and any obstacles they put in his way, amounting to many times his own mass and volume. The most composed of his victims may have had time to wonder if this was due to the caustic enzymes which stung the ground as they dripped from his gaping mouth, although such musings were abruptly concluded. Even this feeding frenzy did nothing to satiate Kog'Maw's appetite. His swathe of destruction continues still as he is inexorably drawn towards Malzahar. What happens when he finds him is anyone's guess.

"If that's just hungry, I don't want to see angry."


PassiveIcathian SurpriseBanshee's Veil.png
Icathian Surprise.png
(Innate) Upon dying, Kog'Maw starts a chain reaction in his body which causes him to detonate after 4 seconds, dealing true damage to surrounding enemies.
Damage: 100 + (25 x level)

QCaustic SpittleBanshee's Veil.png
Caustic Spittle.png
(Active) Launches a corrosive projectile that deals Magic Damage to the first enemy hit and reduces its Armor and Magic Resist for 4 seconds..
Cost: 40 Mana
Cooldown: 8 seconds
Magic Damage: 60 / 110 / 160 / 210 / 260
(+70% of Ability Power)
Armor and Magic Resist Reduction: 20 / 22 / 24 / 26 / 28%

WBio-Arcane BarrageBanshee's Veil.png
Bio-Arcane Barrage.png
(Active) For 6 seconds, Kog'Maw's basic attacks:
  • Gain bonus attack range.
  • Gain 100% Total Attack Speed and his spell cast times are halved.
  • Deal 55% damage to non-minions but fully applies on-hit effects.
  • Deal base plus 2% (+0.75% of 100 Ability Power) of the target's maximum health as additional magic damage.


Cost: No Cost
Cooldown: 17 seconds
Base Damage: 4 / 8 / 12 / 16 / 20
Bonus Range: 90 / 120 / 150 / 180 / 210

EVoid OozeBanshee's Veil.pngCleanseQss.png
Void Ooze.png
(Active) Deals Magic Damage to enemies it passes through and leaves a trail on the ground for 4 seconds, briefly slowing enemies in it.
Cooldown: 12 seconds
Cost: 80 / 90 / 100 / 110 / 120 Mana
Magic Damage: 60 / 110 / 160 / 210 / 260
(+70% of Ability Power)
Slow: 20 / 28 / 36 / 42 / 50%

RLiving ArtilleryBanshee's Veil.png
Living Artillery.png
(Active) Fires an artillery shot, dealing magic damage based on the target's missing health, revealing them for 2 seconds. The cost of subsequent shots within 10 seconds increases by 50 Mana (max 500).
Cost: 50 Mana
Cooldown: 2 / 1.5 / 1 second(s)
Magic Damage (Above 50%): 70 / 110 / 150
(+65% of bonus Attack Damage)
(+25% of Ability Power)
Magic Damage (25% - 50%): 80 / 120 / 160
(+130% of bonus Attack Damage)
(+50% of Ability Power)
Magic Damage (Below 25%): 80 / 120 / 160
(+195% of bonus Attack Damage)
(+75% of Ability Power)

Competitive Usage

In Premier Tournaments
Event Bans Picks Wins Losses Win % Picked/Banned in % of Games
Ogn logo.png HOT6iX Champions Spring 2014 0 11 8 3 72.7 12.9
LCS logo small.png 2014 NA LCS Spring Round Robin 0 1 0 1 0 0.9
GPL logo small.png 2014 GPL Spring 0 3 3 0 100 3.3
GPL logo small.png 2014 GPL Winter 0 3 2 1 66.7 3.4
Riot 2019 logo small.png Season 3 World Championship 1 7 5 2 71.4 12.7

Patch History


Template:AnchorKog'MawSquare.png Kog'Maw
Q shred up at early levels. W damage down.

When last we joined Kog’Maw on his adventures through patch notes, we spoke a lot about giving hypercarries a more even power curve than just ‘great late, awful early.’ These changes are furthering that philosophy, letting Kog feel like he gets to have a Q and reining in his insane power spike.

Caustic Spittle.png Q - Caustic Spittle

ARMOR/MR SHRED : 12/16/20/24/28% 20/22/24/26/28%

Bio-Arcane Barrage.png W - Bio-Arcane Barrage

BASE ON-HIT DAMAGE : 10/15/20/25/30 4/8/12/16/20

Attack speed per level up. Q cost down. W has a base damage, but no longer grants any attack speed per rank.

Before we talk 6.5, let’s talk about how we got here.

Kog’Maw’s identity is one of the clearest we have in league - a baby voidling that if sheltered and protected, grows into a hyper-carrying win condition all his own. Historically this has been done through balancing his laning phase to a state where it’s nearly impossible to withstand aggression, given that the rewards for succeeding were that you’d have an extremely powerful Kog’Maw on your team. Cut to the Marksman Update for Preseason, and now Kog has an additional tradeoff for his power - specifically ‘can you engineer a fight such that he can stand still and obliterate everything in sight’. Granted, the tradeoffs between high damage and mobility isn’t actually ordinary for a Marksman - they usually kite and fight simultaneously. Understandably, the early days of Kog’Maw’s update were a rough learning time for us all. We had a glass cannon that was all glass and no cannon.

So we thought, ‘If he’s not performing, let’s give him some love in a way that boosts his laning phase!’ That was 6.3. Terror ensued.

Back in the present, we’re looking to make a sustainable Kog’Maw for the long-term, free from the binary teeter-totter of ‘really strong or really weak’ that hypercarries tend to fall into. The changelist below represents a shift in thinking about Kog’s power curve - he’ll still scale incredibly with items, but that curve is now more even across the game (rather than spiking at any one particular point). Smoothing this curve means that Kog’s lane can be in a state that’s relatively normal compared to his peers, but the ‘race against the clock’ should feel less harsh for those that fall behind. Kog’Maw may always be the posterchild for what the term ‘hyper-carry’ means in League of Legends, but the hope is for that term to extend beyond just ‘bad lane, great late game’ and into meaningful interactions between the champions and their environments.



Caustic Spittle.png Q - Caustic Spittle

COST : 60 mana 40 mana

Bio-Arcane Barrage.png W - Bio-Arcane Barrage

REMOVED SPITSTORM : No longer gains attack speed passively
LET’S TRY THAT AGAIN : Now deals 5/10/15/20/25 additional base damage on-hit (instead of a minimum of 15 damage)

Attack speed down.

Since easing up on his laning-phase leash in 6.3, Kog'Maws taken revenge on his oppressors in a truly gruesome fashion. None would disagree Kog needs to be toned down, but let's go in-depth on the tactics. Toning down his attack speed might seem counterintuitive considering he's supposed to be a cute, corrosive machine-gun, but it's all about creating windows of power that are more nuanced than 'strong all the time.' Striking his core stat pushes Kog'Maw to be more careful around how he manages Bio-Arcane Barrage's uptime, as he'll be much less of a face-melting menace without it. Final note: you can consider this a two-part changelist as we dive deeper in 6.5 to see how we can get Kog to feel good about his abilities (Q and R in particular) when he's not right clicking and standing still.


BASE ATTACK SPEED : 0.665 0.625

Q's attack speed passive shifted to W. W now has a minimum damage.

Now the definition of 'Glass Cannon' in League, Kog'Maw finds himself a little too brittle to get out of lane and into a state where he can aim for a high-scaling fantasy. The primary goal is to clean up Kog's rank-ups to feel less like a trap and help him smooth out that transition from 'free kill botlane' to 'hyper-vomit omnicarry' without just handing him a free pass. (Trivia: did You Know that previously ranking W gave you no increase in damage? Sorry about that.)

Caustic Spittle.png Q - Caustic Spittle

REMOVED RAPID SPITTLE : No longer passively grants Kog'Maw bonus attack speed

Bio-Arcane Barrage.png W - Bio-Arcane Barrage

NEW SPITSTORM : Now passively grants Kog'Maw 15/20/25/30/35% bonus attack speed
NEW MINIMUM DAMAGE : Now deals at least 15 bonus magic damage at all ranks

W’s attack damage ratio is gone, but now has a base damage.

Kog’Maw’s the same vomit-happy hypercarry he’s always been, but the update went too far in removing base damages from his kit. What we end up with is a Kog that’s incredibly hard to stop once he gets going, but lacking in the tools to get there reliably. Removing the ratio and reinstating the base does trim Kog’s highs, but gives him an expected damage floor to tap into when he’s not consuming everything.

Bio-Arcane Barrage.png W - Bio-Arcane Barrage

REMOVED ATTACK damage ratio : No longer deals 1.25% per 100 attack damage of the target's maximum health as magic damage
NEW FLAT damage : Now deals 2% of the target's maximum health as magic damage


When someone says Kog'Maw, the word 'hypercarry' is never far behind. Already one of the most strategically distinct marksmen, we're pushing him above and beyond - disregarding the attack speed cap, the enemy's composition, and even their feelings. Power does come at a price however, so while Kog is busy spewing acid (and whatever else) onto his foes he's unable to budge without giving up his unparalleled damage stream. A well-protected Kog'Maw will bring down anyone, anywhere, but leave him out to dry and he's just another Kog in the machine.


NOT FULL : Recommended Items updated
BASE HEALTH : 546 517
BASE ATTACK DAMAGE : 52.04 54.46
BASE ATTACK SPEED : 0.665 0.625
BASE MANA : 298.88 322.2

Caustic Spittle.png Q - Caustic Spittle

PASSIVE ATTACK SPEED : 10/15/20/25/30% 15/20/25/30/35%

Bio-Arcane Barrage.png W - Bio-Arcane Barrage
While active, Kog'Maw gains bonus range, 100% attack speed from all sources, and a raised attack speed cap of 5.0.

DURATION : 8 seconds 6 seconds
COST : 40 mana
COOLDOWN : 17 seconds on cast 13/11.5/10/8.5/7 seconds once the buff expires
BONUS RANGE : 130/150/170/190/210 90/120/150/180/210
REDUCED DAMAGE : Now reduces all of Kog'maw's damage against non-minions by 55% while active
BONUS DAMAGE : Deals 1.25% per 100 total AD plus 0.75% per 100 AP of the target's maximum health as additional magic damage
ULTRA RAPID KOG'MAW : Now doubles Kog'Maw's attack speed cap and reduces cast times by 50% while active

Living Artillery.png R - Living Artillery

COST : 40 mana 50 mana
DAMAGE : 80/120/160 70/110/150
VISION DURATION : 4 seconds 2 seconds
MANA DEBUFF DURATION : 6 seconds 10 seconds
REMOVED DON'T TOUCH THAT : No longer deals 100% increased base damage to champions
NEW SMELLS LIKE FEAR : Now deals double damage to enemies between 25% and 50% health
NEW SMELLS LIKE DESPERATION : Now deals triple to enemies between 0% and 25% health


"We're making readability improvements to a bunch of the champion portrait icons which were added or updated over the past few months."
  • PORTRAITS : The following champion portrait icons have been updated:
    • Azir, Cho'Gath, Ezreal, Gragas, Graves, Janna, Jarvan IV, Kayle, Kog'Maw, Lee Sin, Malphite, Maokai, Orianna, Renekton, Rengar, Rumble, Shyvana, Sion, Talon, Tristana, Udyr, Vayne, Veigar, Viktor, Zilean

Splash Updates

"As we've mentioned previously, the splash art team is engaged in a long-term effort to update our oldest base splashes. A few more are ready to go this patch!"
  • SPLASH The following champions have received updated base splashes (click the portraits for the full image!):

Koggy moves slower and R chunks champions for less.

"Despite our changes in 4.13, Kog'Maw still has few weaknesses for his ultra-powerful late game identity. Since our goal is to to preserve a champion's strategic strengths even as we reduce power, we started with Kog's core weaknesses (low mobility) before tackling his early game strengths."
  • General
    • BASE MOVEMENT SPEED 330 ⇒ 325
  • VoidOoze.jpg E - Void Ooze
    • WHEN DID YOU EAT THAT, KOG'MAW Has new particles, looks more gross
  • LivingArtillery.jpg R - Living Artillery

Kog's got less base health and his Q shreds less armor / MR at lower ranks

"When we made our AD itemization changes back in 4.10, Kog'Maw got significantly stronger on top of his already strong base kit. We still want Koggles to hit his late game power, but in order to get there he needs to have a real weakness in the early to mid game. As a quick rundown on why these changes specifically: Kog's current favored item build (Trinity Force + Blade of the Ruined King) lets him build more utility / tank than traditional Infinity Edge marksmen, but he can still deal tons of damage with Q's high base shred + W's damage amp. Now he'll just take a little longer to hit that level of effectiveness."
  • General
    • BASE HEALTH 524 ⇒ 487
    • HEALTH PER LEVEL 84 ⇒ 87
  • CausticSpittle.jpg Q - Caustic Spittle
    • ARMOR & MAGIC RESISTANCE SHRED 20/22/24/26/28% ⇒ 12/16/20/24/28%


  • LivingArtillery.jpg R - Living Artillery
    • "NEW"' UTILITY: Mana cost is now displayed on the cast icon (similar to Kassadin's Rift Walk)
    • BUGFIX: Tooltip corrected to display the actual range (1400/1700/2000 ⇒ 1200/1500/1800)

Late game, Caustic Spittle's lower cast range often clashed with Kog's Bio-Arcane Barrage empowered attack range, so we're clarifying Kog'Maw's role as an artillery-lobbing, tank-shredding, spittle-spitting, purple people-eating, puppy-monster… thing.

Caustic Spittle is now a straight line skill shot with a longer range. It has a higher base damage and now shreds the target's armor and magic resistance.

  • CausticSpittle.jpg Q - Caustic Spittle
    • "NEW" UTILITY: Targeted ability ⇒ Now a straight line skill shot
    • "NEW'" ARMOR AND MAGIC RESISTANCE SHRED: Flat 5/10/15/20/25 ⇒ 20/22/24/26/28%
    • RANGE: 625 ⇒ 1000
    • BASE DAMAGE: 60/110/160/210/260 ⇒ 80/130/180/230/280
    • ABILITY POWER RATIO: 0.7 ⇒ 0.5
  • Bio-ArcaneBarrage.jpg W - Bio-Arcane Barrage
    • "NEW" MANA COST: 50 ⇒ Now has no mana cost
  • LivingArtillery.jpg R - Living Artillery
    • BUGFIX: Fixed tooltip to reflect that only the base damage is amplified versus champions


  • Void Ooze
    • Fixed a bug where the slow wasn't reduced by tenacity



  • Base Movement Speed increased by 25.


  • Living Artillery additional cost stack maximum incresaed to 10 from 5 (max mana cost increased to 400 from 200)


  • Living Artillery damage bonus to Champions reduced to 125% form 150%


  • Void Ooze
    • Slow reduced to 20 / 28 / 36 / 44 / 52% from 28 / 36 / 44 / 52 / 60%


  • No longer regenerates health in Icathian Surprise


  • On Dominion only, Kog'Maw's respawn timer will start when Icathian Surprise ends, rather than when it begins


  • Fixed a bug where where if you killed an enemy that exploded using Icathian Surprise, the enemy was awarded an extra kill (Shaco Hallucinate clone, Maokai)
  • Fixed a bug where Brand's Pyroclasm would give Brand an extra kill if it was traveling toward Kog'maw when Icathian Surprise triggered
  • Fixed a bug where if Ignite killed Kog'maw, it would cause Icathian Surprise to not trigger
  • Fixed a bug where Vayne's Silvered Bolts sometimes caused Icathian Surprise to not trigger


  • Bio-Arcane Barrage attack range bonus reduced to 130 / 150 / 170 / 190 / 210 from 130 / 160 / 190 / 220 / 250


  • Bio-Arcane Barrage duration reduced to 8 seconds from 10


  • Tooltips now properly display numbers in its passives as it updates


  • Updated Living Artillery's reveal particle effect


  • Fixed a bug where Void Ooze was not flagged as an area-of-effect spell
  • Updated Kog'Maw's autoattack frame to be more responsive
  • Updated Caustic Spittle's attack frame to be more responsive
  • Bio-Arcane Barrage
    • Updated attack frame to be more responsive
    • Cooldown increased to 17 seconds from 15
    • Duration increased to 10 seconds from 6
  • Living Artillery drop time reduced slightly to increase consistency (Overall slightly faster)


  • Updated recommended items
  • Caustic Spittle
    • Cast range increased to 625 from 600
    • Now lowers both magic resist and armor
  • Bio-Arcane Barrage cooldown decreased to 15 seconds from 17
  • Living Artillery now scales with attack damage and ability power at a 0.5 ratio
  • Void Ooze width increased slightly


  • Fixed a bug that was causing Void Ooze's targeting display to be offset


  • Fixed a bug where Void Ooze counted as individual units and could break things like Mushrooms, block skillshots, etc


  • Fixed a display bug with Bio-Arcane Barrage attacks on several skins


  • Base movement speed reduced to 305 from 310


  • Bio-Arcane Barrage
    • Fixed a bug where it was doing more damage than intended
    • Fixed a bug where it was dealing physical damage instead of magic damage


  • Fixed several bugs with Icathian Surprise to be more consistent


  • Bio-Arcane Barrage cooldown increased to 17 seconds from 15 at all levels


  • Fixed a bug where Caustic Spittle was giving multiplicative attack speed rather than base


  • Living Artillery's buff on Kog'Maw now correctly states that the increased cost per stack is 40


  • Caustic Spittle has been remade and now grants
    • Passively increases attack speed by 10 / 15 / 20 / 25 / 30%
    • Active deals 60 / 110 / 160 / 210 / 260 damage and reduced the target's armor by 5 / 10 / 15 / 20 / 25 for 4 seconds
  • Bio-Arcane Barrage cooldown reduced to 15 seconds from 20
  • Void Ooze cooldown reduced to 12 seconds from 13


  • Base attack range increased to 500 from 450
  • Caustic Spittle range incresaed to 625 from 600
  • Bio Arcane Barrage bonus range reduced to 130 / 160 / 190 / 220 / 250 from 140 / 180 / 220 / 260 / 300


  • Fixed a bug where Zilean's Chronoshift would not prevent Kog'Maw from dying

 Kog'Maw released


  • 2015
  • 2014

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