

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.
All Ranks Champions Analysed: 48,944,340
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 support vs support Counters
Karthus support on Patch 7 is the strongest counter to support champions of Lux, Nautilus & Leona. While Karthus support is countered most by support champions of Thresh, Lulu & Nami. Below is a detailed breakdown of Karthus support counters against support champions with a minimum of 100 games.


Thresh
the Chain Warden
Karthus wins against Thresh 40.00% of the time which is 10.02% lower against Thresh than the average opponent.
After normalising both champions win rates Karthus wins against Thresh 7.31% less often than would be expected.
The average opponent winrate against Thresh is 50.02%.


Lulu
the Fae Sorceress
Karthus wins against Lulu 40.17% of the time which is 8.70% lower against Lulu than the average opponent.
After normalising both champions win rates Karthus wins against Lulu 5.99% less often than would be expected.
The average opponent winrate against Lulu is 48.87%.


Nami
the Tidecaller
Karthus wins against Nami 43.52% of the time which is 4.44% lower against Nami than the average opponent.
After normalising both champions win rates Karthus wins against Nami 1.74% less often than would be expected.
The average opponent winrate against Nami is 47.96%.


Morgana
the Fallen
Karthus wins against Morgana 46.67% of the time which is 2.12% lower against Morgana than the average opponent.
After normalising both champions win rates Karthus wins against Morgana 0.58% more often than would be expected.
The average opponent winrate against Morgana is 48.79%.


Leona
the Radiant Dawn
Karthus wins against Leona 47.71% of the time which is 1.45% lower against Leona than the average opponent.
After normalising both champions win rates Karthus wins against Leona 1.26% more often than would be expected.
The average opponent winrate against Leona is 49.16%.


Nautilus
the Titan of the Depths
Karthus wins against Nautilus 52.00% of the time which is 1.12% higher against Nautilus than the average opponent.
After normalising both champions win rates Karthus wins against Nautilus 3.83% more often than would be expected.
The average opponent winrate against Nautilus is 50.88%.


Lux
the Lady of Luminosity
Karthus wins against Lux 52.40% of the time which is 2.48% higher against Lux than the average opponent.
After normalising both champions win rates Karthus wins against Lux 5.19% more often than would be expected.
The average opponent winrate against Lux is 49.92%.