Kaynvs Karthus
Kayn vs Karthus is a decisive matchup in LoL patch 26.19. Kayn wins with a 56.7% win rate (+13.3%) over Karthus based on 30 games. Kayn holds the advantage in both the early and late game. Below you'll find the best Kayn build, runes, laning stats, and strategies for the Kayn vs Karthus matchup.
Kayn Matchup Breakdown
Use the dropdown to select an opponent and see a detailed breakdown of how Kayn performs against them. You'll get head-to-head win rates, laning stats, the best build and runes for the matchup, and early vs late game analysis — all based on real ranked data.
Who wins Kayn vs Karthus?
Kayn wins 47.5% of these games. With this many games the true rate is most likely between 36.9% and 58.3% (95% range).
- Expected
- 51.4% From both champions' overall Jungle win rates
- Matchup effect
- −3.9 pts Observed minus expected
- Sample
- 80 games Lane: Jungle
- vs patch 26.18
- −3.2 pts Within normal patch-to-patch noise
Lane: Jungle · Ranked Solo/Duo & Flex · North America server · All ranks · Patch 26.19 · Sep 24 – Sep 28
Key takeaways
- Current data slightly favors Karthus, but the sample is too limited for a strong conclusion: Kayn wins 47.5% of 80 games (95% range 36.9–58.3%).
- Both champions' overall Jungle win rates predict 51.4% for Kayn; the result is within the margin of error of that, so this matchup mostly reflects the two champions' general strength.
- Neither side reliably wins the lane: the average gold difference at 15 minutes is 79, within the margin of error (79 games).
- Kayn players pick Legend: Haste much less often against Karthus: 49.3% of their other Jungle games, 22.5% here.
How we calculate this
Games: ranked Solo/Duo and Flex games on the North America server from the patch shown. Remakes (games under 5 minutes) are excluded.
A game only counts when Kayn and Karthus played the same position on opposite teams, so roaming, lane swaps within a team or a champion merely being in the same game never count as this matchup.
The 95% range is a Wilson score interval. Confidence comes from how wide that range is: within ±3 points is very high, ±5 high, ±8 moderate, anything wider low. Below 20 games a matchup is not classified at all.
Expected win rate combines both champions’ win rates in this lane (same games and filters) with the log5 formula: E = A(1−B) / (A(1−B) + B(1−A)). Matchup effect = observed − expected.
"What changes" compares Kayn's choices in this matchup with the same champion's other games in the same lane, and lists a change only when it is at least 3 points and statistically significant (two-proportion z-test, |z| ≥ 2, 20+ games).
Results are not split by rank: the sample per rank is too small for honest per-rank matchup numbers.
Kayn vs Karthus Laning Stats
At 15 minutes
Whole-game averages
Kayn vs Karthus Win Rate by Game Length
Kayn's win rate against Karthus by game length. The dot is the win rate, the bar its 95% range and the dashed line the champion's usual win rate at that length. Lengths with fewer than 25 games are left blank.
No game length stands out: Kayn's results against Karthus in short and long games are within the margin of error of each other.
Kayn vs Karthus Power Spikes
Who is ahead at each stage, measured from these games. A stage reads "Even" when the difference is inside the margin of error, and "Insufficient data" when there are too few games to tell.
- Lane (15 min)EvenKayn gold at 15: +79
- First itemEvenKayn: 0.2 min · Karthus: 0.2 min
- Games under 20 minInsufficient data
- 20–30 min gamesInsufficient data
- 30+ min gamesEvenKayn wins 49.0% of 49 games
What Kayn Changes Against Karthus
Choices Kayn players make noticeably more or less often in this matchup than in their other Jungle games.
Legend: HasteRuneUsually49.3%vs Karthus22.5%−26.8 pts
Grisly MementosRuneUsually39.7%vs Karthus65.0%+25.3 pts51.9% WR here
Dark HarvestKeystoneUsually43.1%vs Karthus67.5%+24.4 pts53.7% WR here
Last StandRuneUsually45.6%vs Karthus21.3%−24.3 pts
ConquerorKeystoneUsually45.2%vs Karthus23.8%−21.4 pts
Edge of NightItemUsually15.3%vs Karthus36.3%+20.9 pts48.3% WR here
Plated SteelcapsBootsUsually30.1%vs Karthus10.0%−20.1 pts
InspirationSecondary treeUsually47.4%vs Karthus65.0%+17.6 pts51.9% WR here
Best Kayn Build vs Karthus
Usual Kayn build (Jungle)
67.7% win rate · 127 games
Against Karthus
Not enough matchup-specific build data: only 12 of 57 Kayn games against Karthus carried a complete build, which is too few to recommend an item path from. Use Kayn's standard build instead.
- Kayn usually completes Gustwalker Hatchling first, at 0.2 min (median of 41 games).
- Karthus usually completes Scorchclaw Pup first, at 0.2 min (median of 62 games).
- Skill priority: Q > W > E — the same as usual.
Builds are ranked by the lower edge of their win rate range, not the raw win rate, so a build seen in a handful of wins never outranks a proven one.
Best Kayn Runes vs Karthus
Usual Kayn runes (Jungle)
Fleet Footwork
81.3% win rate · 16 games
Against Karthus
Dark Harvest
57.1% win rate · 35 games
Plan your Kayn draft in Draft Lab
Draft Lab lays out both teams lane by lane with live matchup win rates, damage profiles and game-phase lean, and suggests picks and bans from current meta data.
- Full 5v5 draft board
- Lane matchup win rates
- Pick and ban suggestions
Kayn matchup data for League of Legends patch 26.19. The table below shows Kayn's win rate, gold difference, and performance stats against every champion in the current meta. Click any champion name to see a detailed head-to-head breakdown including the best Kayn build, runes, laning stats, and early vs late game analysis for that specific matchup.
Other Kayn Matchups
Hardest for Kayn
Easiest for Kayn
Win rate and games for each matchup. Lists are ranked by the edge of the 95% range so small samples cannot top them; matchups with at least 50 games only.
Help us maintain accuracy! If you notice incorrect stats, missing data, or any issues, your feedback directly improves the quality of our data for the entire community.
Kayn vs Karthus FAQ - Patch 26.19
Who wins Kayn vs Karthus?
Current data slightly favors Karthus, but the sample is too limited for a strong conclusion: Kayn wins 47.5% of 80 games (95% range 36.9–58.3%).
What is Kayn's win rate against Karthus?
Kayn wins 47.5% of 80 Jungle games against Karthus on patch 26.19 (95% range 36.9–58.3%). Based on both champions' overall Jungle win rates, 51.4% would be expected.
Does Kayn counter Karthus?
Not clearly. Kayn wins 47.5% of 80 games against Karthus, and the 95% range (36.9–58.3%) includes 50%, so neither champion reliably counters the other on current data.
Who wins lane, Kayn or Karthus?
Neither side reliably wins the lane: the average gold difference at 15 minutes is 79, within the margin of error (79 games).
Does Kayn outscale Karthus?
There are too few games of each length to tell yet.
When is Karthus strongest against Kayn?
On current data there is no stage of the game where Karthus is ahead of Kayn beyond the margin of error.
What should Kayn build against Karthus?
There are not enough games for a matchup-specific core, so use Kayn's usual Jungle core: Voltaic Cyclosword, Hubris, Death's Dance. The biggest change against Karthus: Edge of Night (15.3% usually, 36.3% here).
What runes should Kayn use against Karthus?
Dark Harvest with Domination and Inspiration — 57.1% over 35 games against Karthus. The biggest change against Karthus: Legend: Haste (49.3% usually, 22.5% here).