

Karthus vs Naafiri Counter Pick
Matchup Summary
What the Data Means
The difficulty ratings do most of the explaining. Naafiri is rated 2, among the most forgiving kits in the game, while Karthus is a 7 whose damage depends on placing delayed blasts accurately. Over 504 games on patch 16.13.1 that asymmetry reads as 43.1% for him: a matchup asking one player for precision and the other for a straight commitment tends to settle this way.
Her damage is physical, so the magic resistance Karthus would otherwise want is wasted, and his 21 base armor rising to only 100.9 at level 18 is the softest part of his profile. We Are More sends packmates at whatever she attacks, so burst arrives from several sources at once, and Darkin Daggers applies bleed before Hounds’ Pursuit closes the distance. At 340 movement speed she is five units quicker on foot and carries two dashes on top of that.
The window he has is a slow one. Wall of Pain cuts movement speed and magic resistance for anything crossing it, and placed at the mouth of a camp it strips the speed The Call of the Pack grants. Defile punishes a pack that stays on him, and Death Defied lets a Requiem finish after he falls — Naafiri ends at 610 base health and 2,395 at level 18, inside execute range more often than her damage output suggests.
FAQ
No — current data marks this as a counter matchup: Naafiri has the statistical edge. Karthus wins 43.1% of the recorded games.
43.1% from Karthus's perspective, measured on patch 16.13.1.
504 ranked games at Emerald rank and above, across all regions.
The current Karthus build — items, runes and skill order from the same data set — is on the Karthus build page.