Source: Ranked + player metaPatch: 16.17Window: patchRegion: allRank: emerald_plusQueue: ranked_soloSample: 38Updated 10/28/2026, 4:34:43 AM
Confidence: Medium-2.6% vs 50%38 games
Lane phases
AI heuristicLevels 1–2
Karthus edge
Karthus has stronger early trades — respect all-ins.
Levels 3–5
Karthus edge
Cassiopeia needs to play safe until item spikes.
Level 6+
Karthus edge
Ultimate timing often swings the next two waves.
Mid / late
Even
If Cassiopeia reaches items, teamfights can neutralize the lane loser.
Why?
AI heuristicHard
- Sample win rate for Cassiopeia is 47.4% in this matchup.
- Karthus statistically wins more often in the current Emerald+ sample.
Treat this as a Hard matchup for Cassiopeia into Karthus — prioritize cooldown windows and jungle tracking.
Do
- Give up early shove if Karthus 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 Cassiopeia page (Mid): Deathfire Touch Build · 51.3% WR · 261 games
Skill order: E › Q › W
Keystones (player meta)
Most common keystones when cassiopeia faces karthus in lookup-discovered matches.
Deathfire Touch1G0.0%
Patch: 16.17Region: naRank: emerald_plusQueue: ranked_soloSample: 291Updated 10/22/2026, 1:02:15 PM