MacroMind matchup data: real ranked games, not opinions
Karthus vs Rengar
How often does Karthus beat Rengar in Jungle?
Karthus into Rengar in Jungle: 51% observed win rate across 448 ranked games.
Global ranked sample: games from every region and every rank pooled together, not one server's stats. Data runs through patch 26.12; curves updated 2026-08-07.
By 15 minutes the median game has Karthus ahead by 136 gold.
Karthus at 15:00
- Gold: +136
- CS: +13
- XP: +464
Typical gap to Rengar, from 448 games that reached 15:00.
Does Karthus counter Rengar?
No counter here: Karthus sits at 51% over 448 games. The swing lives in the spots below, so play the side you know better and chase the row that moves the number the most in this lane, then hold that lead through the first back.
Beating Rengar: the Karthus game plan
A gold lead at 10:00 puts Karthus at 56% across 230 games. Flip the lead and Karthus falls to 46% across 217.
| The spot | Win rate | Games |
|---|---|---|
| Ahead in gold at 10:00 | 56% | 230 |
| Behind in gold at 10:00 | 46% | 217 |
| First blood | 55% | 199 |
| +kills at 10:00 | 63% | 156 |
| +CS at 10:00 | 56% | 319 |
| 0 deaths at 10:00 | 57% | 60 |
Someone usually dies here around 4:22 in the median game, and level 6 lands near 6:45. Until your spike is online, respect the all-in.
Karthus's Jungle build, with receipts
Into Rengar specifically, Karthus finishes Blackfire Torch first most often: 50.6% over 172 games of this matchup.
The most-finished Karthus core is Blackfire Torch, Shadowflame, Rabadon's Deathcap: 53.6% across 1,882 games when all three got done. All matchups, patches 26.1-26.12.
Most games start Scorchclaw Pup + Health Potion; the first finished item is usually Blackfire Torch (8,818 games).
Skill plan: Karthus players max Q first and take Q at level 1.