Karthusvs Rengar
Karthus vs Rengar is a decisive matchup in LoL patch 26.19. Karthus wins with a 53.9% win rate (+7.7%) over Rengar based on 13 games. Karthus holds the advantage in both the early and late game. Below you'll find the best Karthus build, runes, laning stats, and strategies for the Karthus vs Rengar matchup.
Karthus Matchup Breakdown
Use the dropdown to select an opponent and see a detailed breakdown of how Karthus 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 Karthus vs Rengar?
Karthus wins 54.5% of these games. With this many games the true rate is most likely between 34.7% and 73.1% (95% range).
- Expected
- 52.7% From both champions' overall Jungle win rates
- Matchup effect
- +1.8 pts Observed minus expected
- Sample
- 22 games Lane: Jungle
- vs patch 26.18
- — Not enough games on both patches
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: Karthus wins 54.5% of 22 games (95% range 34.7–73.1%).
- Both champions' overall Jungle win rates predict 52.7% for Karthus; the result is within the margin of error of that, so this matchup mostly reflects the two champions' general strength.
- Karthus players pick Zhonya's Hourglass far more often against Rengar: 19.8% of their other Jungle games, 45.5% 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 Karthus and Rengar 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 Karthus'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.
Karthus vs Rengar Laning Stats
Only 22 games have a 15-minute snapshot so far — the lane-phase numbers appear from 30.
Whole-game averages
Karthus vs Rengar Win Rate by Game Length
Karthus's win rate against Rengar 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: Karthus's results against Rengar in short and long games are within the margin of error of each other.
Karthus vs Rengar 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)Insufficient data
- First itemInsufficient data
- Games under 20 minInsufficient data
- 20–30 min gamesInsufficient data
- 30+ min gamesInsufficient data
What Karthus Changes Against Rengar
Choices Karthus players make noticeably more or less often in this matchup than in their other Jungle games.
Usually19.8%vs Rengar45.5%+25.7 pts
Scorchclaw PupStarting itemsUsually17.5%vs Rengar36.4%+18.9 pts
RiftmakerItemUsuallyunder 0.5%vs Rengar4.5%+4.5 pts
Mosstomper Seedling + Stealth WardStarting itemsUsuallyunder 0.5%vs Rengar4.5%+4.5 pts
Gustwalker Hatchling + Health Potion + Stealth Ward + Oracle LensStarting itemsUsuallyunder 0.5%vs Rengar4.5%+4.5 pts
Sudden ImpactRuneUsuallyunder 0.5%vs Rengar4.5%+4.5 pts
Best Karthus Build vs Rengar
Usual Karthus build (Jungle)
71.1% win rate · 38 games
Against Rengar
Not enough matchup-specific build data: only 2 of 17 Karthus games against Rengar carried a complete build, which is too few to recommend an item path from. Use Karthus's standard build instead.
- Rengar usually completes Gustwalker Hatchling first, at 0.2 min (median of 20 games).
- Skill priority: Q > E > W — 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 Karthus Runes vs Rengar
Usual Karthus runes (Jungle)
Deathfire Touch
57.0% win rate · 79 games
Against Rengar
Too few games for a matchup-specific rune page yet — use the usual page.
Plan your Karthus 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
Karthus matchup data for League of Legends patch 26.19. The table below shows Karthus'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 Karthus build, runes, laning stats, and early vs late game analysis for that specific matchup.
Other Karthus Matchups
Hardest for Karthus
Easiest for Karthus
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.
Karthus vs Rengar FAQ - Patch 26.19
Who wins Karthus vs Rengar?
Current data slightly favors Karthus, but the sample is too limited for a strong conclusion: Karthus wins 54.5% of 22 games (95% range 34.7–73.1%).
What is Karthus's win rate against Rengar?
Karthus wins 54.5% of 22 Jungle games against Rengar on patch 26.19 (95% range 34.7–73.1%). Based on both champions' overall Jungle win rates, 52.7% would be expected.
Does Karthus counter Rengar?
Not clearly. Karthus wins 54.5% of 22 games against Rengar, and the 95% range (34.7–73.1%) includes 50%, so neither champion reliably counters the other on current data.
Who wins lane, Karthus or Rengar?
There are not enough games with a 15-minute snapshot yet (22) to say who wins lane.
Does Karthus outscale Rengar?
There are too few games of each length to tell yet.
When is Rengar strongest against Karthus?
On current data there is no stage of the game where Rengar is ahead of Karthus beyond the margin of error.
What should Karthus build against Rengar?
There are not enough games for a matchup-specific core, so use Karthus's usual Jungle core: Liandry's Torment, Stormsurge, Shadowflame. The biggest change against Rengar: Zhonya's Hourglass (19.8% usually, 45.5% here).
What runes should Karthus use against Rengar?
Use Karthus's usual Deathfire Touch page (Sorcery + Precision); there are too few games for a matchup-specific page. The biggest change against Rengar: Sudden Impact (under 0.5% usually, 4.5% here).