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This will vary because unlike other stat sites we include 100% of a brackets champions played and never include champions that don't belong in the bracket.
Emerald+ Champions Analysed: 15,551,182
We include 100% of the champions played of every selected tier bracket in our analysis, we never include champions from outside the tier quoted tier.
Karthus Counters
Karthus bottom vs support Counters
Karthus bottom on Patch 15.9 is the strongest counter to support champions of Yuumi, Alistar & Blitzcrank. While Karthus bottom is countered most by support champions of Zilean, Karma & Nami. Below is a detailed breakdown of Karthus bottom counters against support champions with a minimum of 100 games.
Zilean
the Chronokeeper
Karthus wins against Zilean 37.61% of the time which is 10.27% lower against Zilean than the average opponent.
After normalising both champions win rates Karthus wins against Zilean 15.05% less often than would be expected.
The average opponent winrate against Zilean is 47.88%.
Karma
the Enlightened One
Karthus wins against Karma 47.85% of the time which is 2.13% lower against Karma than the average opponent.
After normalising both champions win rates Karthus wins against Karma 6.90% less often than would be expected.
The average opponent winrate against Karma is 49.98%.
Nami
the Tidecaller
Karthus wins against Nami 47.90% of the time which is 0.38% higher against Nami than the average opponent.
After normalising both champions win rates Karthus wins against Nami 4.39% less often than would be expected.
The average opponent winrate against Nami is 47.52%.
Seraphine
the Starry-Eyed Songstress
Karthus wins against Seraphine 48.21% of the time which is 1.67% lower against Seraphine than the average opponent.
After normalising both champions win rates Karthus wins against Seraphine 6.44% less often than would be expected.
The average opponent winrate against Seraphine is 49.88%.
Sona
Maven of the Strings
Karthus wins against Sona 50.00% of the time which is 3.07% higher against Sona than the average opponent.
After normalising both champions win rates Karthus wins against Sona 1.70% less often than would be expected.
The average opponent winrate against Sona is 46.93%.
Janna
the Storm's Fury
Karthus wins against Janna 50.74% of the time which is 2.90% higher against Janna than the average opponent.
After normalising both champions win rates Karthus wins against Janna 1.88% less often than would be expected.
The average opponent winrate against Janna is 47.84%.
Braum
the Heart of the Freljord
Karthus wins against Braum 51.11% of the time which is 3.94% higher against Braum than the average opponent.
After normalising both champions win rates Karthus wins against Braum 0.83% less often than would be expected.
The average opponent winrate against Braum is 47.17%.
Pantheon
the Unbreakable Spear
Karthus wins against Pantheon 51.33% of the time which is 2.08% higher against Pantheon than the average opponent.
After normalising both champions win rates Karthus wins against Pantheon 2.69% less often than would be expected.
The average opponent winrate against Pantheon is 49.25%.
Bard
the Wandering Caretaker
Karthus wins against Bard 51.57% of the time which is 3.15% higher against Bard than the average opponent.
After normalising both champions win rates Karthus wins against Bard 1.63% less often than would be expected.
The average opponent winrate against Bard is 48.42%.
Lulu
the Fae Sorceress
Karthus wins against Lulu 52.24% of the time which is 4.45% higher against Lulu than the average opponent.
After normalising both champions win rates Karthus wins against Lulu 0.33% less often than would be expected.
The average opponent winrate against Lulu is 47.79%.
Leona
the Radiant Dawn
Karthus wins against Leona 52.38% of the time which is 4.28% higher against Leona than the average opponent.
After normalising both champions win rates Karthus wins against Leona 0.50% less often than would be expected.
The average opponent winrate against Leona is 48.10%.
Rakan
The Charmer
Karthus wins against Rakan 52.48% of the time which is 3.24% higher against Rakan than the average opponent.
After normalising both champions win rates Karthus wins against Rakan 1.53% less often than would be expected.
The average opponent winrate against Rakan is 49.24%.
Soraka
the Starchild
Karthus wins against Soraka 53.04% of the time which is 5.01% higher against Soraka than the average opponent.
After normalising both champions win rates Karthus wins against Soraka 0.23% more often than would be expected.
The average opponent winrate against Soraka is 48.03%.
Rell
the Iron Maiden
Karthus wins against Rell 53.31% of the time which is 5.34% higher against Rell than the average opponent.
After normalising both champions win rates Karthus wins against Rell 0.56% more often than would be expected.
The average opponent winrate against Rell is 47.97%.
Fiddlesticks
the Ancient Fear
Karthus wins against Fiddlesticks 53.41% of the time which is 8.10% higher against Fiddlesticks than the average opponent.
After normalising both champions win rates Karthus wins against Fiddlesticks 3.34% more often than would be expected.
The average opponent winrate against Fiddlesticks is 45.31%.
Pyke
the Bloodharbor Ripper
Karthus wins against Pyke 53.74% of the time which is 3.94% higher against Pyke than the average opponent.
After normalising both champions win rates Karthus wins against Pyke 0.83% less often than would be expected.
The average opponent winrate against Pyke is 49.80%.
Nautilus
the Titan of the Depths
Karthus wins against Nautilus 54.02% of the time which is 4.04% higher against Nautilus than the average opponent.
After normalising both champions win rates Karthus wins against Nautilus 0.73% less often than would be expected.
The average opponent winrate against Nautilus is 49.98%.
Milio
The Gentle Flame
Karthus wins against Milio 54.83% of the time which is 7.36% higher against Milio than the average opponent.
After normalising both champions win rates Karthus wins against Milio 2.59% more often than would be expected.
The average opponent winrate against Milio is 47.47%.
Morgana
the Fallen
Karthus wins against Morgana 54.87% of the time which is 5.84% higher against Morgana than the average opponent.
After normalising both champions win rates Karthus wins against Morgana 1.07% more often than would be expected.
The average opponent winrate against Morgana is 49.03%.
Senna
the Redeemer
Karthus wins against Senna 54.95% of the time which is 5.05% higher against Senna than the average opponent.
After normalising both champions win rates Karthus wins against Senna 0.28% more often than would be expected.
The average opponent winrate against Senna is 49.90%.
Thresh
the Chain Warden
Karthus wins against Thresh 55.37% of the time which is 6.99% higher against Thresh than the average opponent.
After normalising both champions win rates Karthus wins against Thresh 2.21% more often than would be expected.
The average opponent winrate against Thresh is 48.38%.
Vel'Koz
the Eye of the Void
Karthus wins against Vel'Koz 56.86% of the time which is 8.11% higher against Vel'Koz than the average opponent.
After normalising both champions win rates Karthus wins against Vel'Koz 3.34% more often than would be expected.
The average opponent winrate against Vel'Koz is 48.75%.
Lux
the Lady of Luminosity
Karthus wins against Lux 57.14% of the time which is 6.05% higher against Lux than the average opponent.
After normalising both champions win rates Karthus wins against Lux 1.29% more often than would be expected.
The average opponent winrate against Lux is 51.09%.
Blitzcrank
the Great Steam Golem
Karthus wins against Blitzcrank 57.93% of the time which is 8.30% higher against Blitzcrank than the average opponent.
After normalising both champions win rates Karthus wins against Blitzcrank 3.53% more often than would be expected.
The average opponent winrate against Blitzcrank is 49.63%.
Alistar
the Minotaur
Karthus wins against Alistar 59.07% of the time which is 10.07% higher against Alistar than the average opponent.
After normalising both champions win rates Karthus wins against Alistar 5.30% more often than would be expected.
The average opponent winrate against Alistar is 49.00%.
Yuumi
the Magical Cat
Karthus wins against Yuumi 59.26% of the time which is 9.47% higher against Yuumi than the average opponent.
After normalising both champions win rates Karthus wins against Yuumi 4.70% more often than would be expected.
The average opponent winrate against Yuumi is 49.79%.
