Patch 26.9 Data
Champion Matchups
Pick two champions and see who wins. Win rates, counters, and tips powered by live ranked data.
Champion 1
Karthus
VS
Champion 2
Udyr
vs

41.3%
Karthus win rate vs Udyr
Udyr hard counters Karthus
344
Games Analyzed
41.3%
Karthus WR
58.7%
Udyr WR
-697
Avg Gold Diff @15
Karthus
DamageAP
StyleSustained
RangeRanged
Difficulty**---
StrongLate game
RunesDark Harvest / Inspiration
SummsFlash + Smite
Udyr
DamageMixed
StyleSustained
RangeMelee
Difficulty**---
StrongEarly game
RunesConqueror / Resolve
SummsFlash + Smite
Power Spike Timeline
Udyr
Level 3
Karthus
Level 6
Udyr
Level 6
Karthus
1 item
Udyr
1 item
Karthus
3 items
How to Play This Matchup
Survive to Scale
Udyr will try to bully you early. Give up CS if needed  your job is to not die. Karthus outscales hard after 2 items. Play for farm, not fights.
Mixed Resistances
Karthus deals AP damage while Udyr deals Mixed. Build resistances accordingly  don't stack the wrong type.
Mirror Playstyle
Both champions play a sustained style. The one with better execution and itemization wins. Focus on spacing and cooldown tracking.
Range Advantage
Karthus has range advantage. Udyr should look for short trades when Karthus uses abilities on the wave. Freeze near your tower and wait for jungle help or an all-in window.
Exploit Karthus's Weakness
Karthus's main weakness: Invaded early, immobile, Zhonya's blocks R. Play around this to maximize your advantage.
Karthus Win Condition
R global damage, passive keeps dealing damage after death
Udyr Win Condition
Fast clear, run at people, stance dance sustain
Recommended Items
Karthus

Liandry's Anguish
Core
Build every game

Shadowflame
Core
Build every game

Rabadon's
Core
Build every game
Udyr
Iceborn Gauntlet
Core
Build every game
Jak'Sho
Core
Build every game

Dead Man's Plate
Core
Build every game

Mercury's Treads
Defensive
MR + tenacity vs Karthus's AP damage and CC
Karthus's Worst Matchups
Udyr's Worst Matchups
Need a fresh account to practice matchups?
Browse LoL Smurfs