Rest in Peace

Patch: 7.22

WhyArcane Comet

If you're able to slow the enemy with [W] first, your Comet is almost guaranteed to hit. Karthus is also able to quickly bring Comet back off cooldown by landing multiple [Q]s in quick succession.

WhyThe Ultimate Hat

Karthus' [R] has a massive cooldown so every point of CDR is that much more valuable. At max stacks your ult will be up 24s sooner.

WhyAbsolute Focus

Absolute Focus is a rune that can provide incredible amount of AP in situations where you're able to sit back and provide damage. In the case of Karthus, stay healthy in lane and look for an early cross-map [R].

WhyGathering Storm

There's not much to say here expect for 'Scaling'. Karth can be one of the hardest scaling AP Mages just by the nature of his [R]. A 40min game means you'll be hitting like a truck.

WhyCoup De Grace

Karth can make great use of Coup De Grace, synergizing well with both is [R] for executions, and when he's in his passive form looking to finish a target.

WhyPresence of Mind

Karthus can actually make pretty surprisingly great use of Presence of Mind with his [E] during teamfights. Pick up kills/assists and that'll empower you to keep your [E] on for free for another 5s.

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