Source: Ranked + player metaPatch: 16.17Window: patchRegion: allRank: emerald_plusQueue: ranked_soloSample: 58Updated 9/11/2026, 8:21:06 PM
Confidence: High-5.2% vs 50%58 games
Lane phases
Levels 1–2
LeBlanc edge
LeBlanc has stronger early trades — respect all-ins.
Levels 3–5
LeBlanc edge
Karthus needs to play safe until item spikes.
Level 6+
LeBlanc edge
Ultimate timing often swings the next two waves.
Mid / late
LeBlanc edge
If Karthus reaches items, teamfights can neutralize the lane loser.
Why?
Sample-basedHard
- Sample win rate for Karthus is 44.8% in this matchup.
- LeBlanc statistically wins more often in the current Emerald+ sample.
Treat this as a Hard matchup for Karthus into LeBlanc — prioritize cooldown windows and jungle tracking.
Do
- Give up early shove if LeBlanc can all-in you.
- Track summoner spells and ultimate cooldowns before committing.
- Play for wave states that let you crash and reset safely.
Don't
- Don't overstay for a plate when behind.
- Don't force extended trades when key abilities are down.
- Don't ignore jungle timers when the lane is volatile.
Matchup build callout
Full builds →Most-played Karthus page (ADC): Deathfire Touch Build · 60.6% WR · 71 games
Skill order: Q › E › W
Patch: 16.17Region: naRank: emerald_plusQueue: ranked_soloSample: 97Updated 9/11/2026, 8:18:15 PM