Karthus: change history

4 changes across 2 patches (May 27, 2026 to Jun 9, 2026), newest first. Nerf Radar tracks the 10 most recent official updates for League of Legends, back to May 27, 2026.

Nerf 4

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Jun 9, 2026League of Legends Patch 26.12Nerf 2Official notes ↗

Nerf

Arena Q (reverted to match SR) Base Damage
Karthus' Q base damage is reverted to match Summoner's Rift, decreasing from 60–140 to 40–116.
60–140→40–116

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Q (reverted to match SR) Base Damage: 60-140 → 40-116

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Arena Q Ability Power Ratio
Karthus' Q ability power ratio decreases from 45% to 35%.
45%→35%

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Q Ability Power Ratio: 45% → 35%
May 27, 2026League of Legends Patch 26.11Nerf 2Official notes ↗

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Arena R cooldown
Karthus' R cooldown increases from 60 to 120 / 100 / 80.
60→120 / 100 / 80

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R cooldown: 60 → 120 / 100 / 80

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Arena AP Ratio
Karthus' AP ratio decreases from 100% to 90%.
100%→90%

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AP Ratio: 100% → 90%

Each step links to the full patch breakdown and to Riot Games's official notes. Changes listed under a general heading such as "Bug fixes" are not included here; search to find every mention.