MacroMind matchup data — real ranked games, not opinions
Karthus vs Jayce
Karthus vs Jayce in Jungle: who wins more often?
Across 427 ranked games in Jungle, Karthus beats Jayce in 54% of them. Observed from real matches — the sample size sits next to the rate, here and on every number below.
By 15 minutes the median game has Karthus behind by 19 gold.
Does Karthus counter Jayce?
No counter call here: Karthus lands at 54% over 427 games, inside the noise band for a sample this size. Neither pick wins the lane on its own — the swing lives in the spots below, so take the side you play better and use the receipts.
Your Karthus game plan against Jayce
With a 300-gold lead at 10:00, Karthus wins 61% of 203 games in this matchup. Down 300 at the same mark, the rate drops to 47% over 224.
| The spot | Win rate | Games |
|---|---|---|
| 300 gold up at 10:00 | 61% | 203 |
| 300 gold down at 10:00 | 47% | 224 |
| First blood | 61% | 238 |
| +kills at 10:00 | 65% | 161 |
| +CS at 10:00 | 59% | 275 |
| 0 deaths at 10:00 | 61% | 97 |
In the median game here, the first death comes near 5:47 and level 6 lands around 6:39. Until your spike is online, treat the all-in window with respect.
Karthus in Jungle: the items that actually get built
Into Jayce specifically, Karthus finishes Blackfire Torch first most often: 58.2% over 213 games of this matchup.
The most-finished core in this exact matchup is Blackfire Torch, Shadowflame, Rabadon's Deathcap: 53.1% across 49 games.
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 16.1-16.12.
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.