Karthus vs Nasus Counter Pick

Movement speed is the quiet number here. Nasus travels at 350 against 335, and Wither strips both movement and attack speed from a single target over its duration. Karthus has no dash, no blink and nothing that removes crowd control; once slowed, a champion whose entire safety plan is a 450-unit cast range and a screen of leeching energy has very little left. The 241 games on patch 16.13.1 return 42.3% for him, which fits.

Nasus deals mixed damage. Siphoning Strike grows permanently as he farms kills with it, Spirit Fire reduces the armor of anyone standing in the flame, and Karthus arrives with 21 base armor and 100.9 at level 18. Soul Eater’s life steal then keeps Nasus topped up through Defile ticks. The argument on the other side is time and space: Wall of Pain reduces magic resistance and speed on anything crossing it, Lay Waste rewards catching an isolated target, and Fury of the Sands raises his health and attack range only while the storm lasts. Death Defied is the equaliser once more, converting a lost duel into a Requiem that lands on every enemy champion. The difficulty ratings sit close, a 7 against a 6, and Karthus reaches 2,490 health at level 18 against 2,418, so the deficit is delivery rather than durability.