MacroMind matchup data: real ranked games, not opinions
Jayce vs Karthus
How often does Jayce beat Karthus in Jungle?
Jayce into Karthus in Jungle: 46% observed win rate across 427 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 Jayce ahead by 20 gold.
Jayce at 15:00
- Gold: +20
- CS: -11
- XP: -686
Typical gap to Karthus, from 426 games that reached 15:00.
Does Jayce counter Karthus?
No counter here: Jayce sits at 46% over 427 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 Karthus: the Jayce game plan
A gold lead at 10:00 puts Jayce at 53% across 224 games. Flip the lead and Jayce falls to 39% across 203.
| The spot | Win rate | Games |
|---|---|---|
| Ahead in gold at 10:00 | 53% | 224 |
| Behind in gold at 10:00 | 39% | 203 |
| First blood | 50% | 266 |
| +kills at 10:00 | 54% | 181 |
| +CS at 10:00 | 57% | 135 |
| 0 deaths at 10:00 | 57% | 98 |
Someone usually dies here around 6:02 in the median game, and level 6 lands near 6:55. Until your spike is online, respect the all-in.
Jayce's Jungle build, with receipts
Into Karthus specifically, Jayce finishes Youmuu's Ghostblade first most often: 42.2% over 187 games of this matchup.
The most-finished core in this exact matchup is Youmuu's Ghostblade, Opportunity, Edge of Night: 44.1% across 59 games.
The most-finished Jayce core is Youmuu's Ghostblade, Opportunity, Edge of Night: 52.3% across 3,541 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 Youmuu's Ghostblade (14,088 games).
Skill plan: Jayce players max Q first and take Q at level 1.