Karthus splash art
Patch 26.20Arena trios · updated Oct 7, 2026

Karthus Arena Build

Karthus, the Deathsinger, is a ranged mage champion. In fights Karthus is a fragile champion who deals magic damage through sustained attacks. Here are the augments Karthus players take most, the Prismatic items worth grabbing and the core build on patch 26.20.

Arena tier
Solid picks
Karthus games this patch
20,741
Skill max
QEW

Quick Answer for Patch 26.20

  1. Jeweled Gauntlet

    Prismatic

    Your Abilities can Critically Strike. Gain Crit Chance.

    Why on Karthus

    You cast Lay Waste (Q) constantly and Requiem (R) hits every enemy champion, so ability crits turn your repeated blasts into big damage spikes.

  2. It's Killing Time

    Gold

    After casting your Ultimate, mark all enemy champions for death. While marked, store damage dealt to them, and detonate the damage when the mark ends.

    Why on Karthus

    Requiem (R) already reaches every enemy champion, and the mark then stores your Lay Waste (Q) and Defile (E) damage for a second detonation on all of them.

  3. ADAPt

    Silver

    Convert Bonus Attack Damage to Ability Power. Gain 10% Ability Power.

    Why on Karthus

    Lay Waste (Q), Defile (E) and Requiem (R) all deal magic damage scaling with Ability Power, so the extra 10% Ability Power raises all of your damage.

In game, Hexgate puts a badge under every augment card you are offered, with how often Karthus players take it.

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Based on 20,741 Karthus games in Arena on patch 26.20. Augments and items are ordered by how often Karthus players take them; the bars compare each one with the most taken.

Best Augments for Karthus by Rarity

Augment offers come in Silver, Gold and Prismatic. These are the cards Karthus players take most at each rarity, most taken first.

Prismatic augments

  1. Jeweled Gauntlet
  2. Spellwake
  3. Eureka
  4. Quest: Wooglet's Witchcap

Gold augments

  1. It's Killing Time
  2. Phenomenal Evil
  3. From Beginning to End
  4. Magic Missile

Silver augments

  1. ADAPt
  2. Witchful Thinking

Best Prismatic Items for Karthus

The Prismatic items Karthus players pick most often from the offer, most picked first.

  1. Detonation Orb
  2. Night Harvester
  3. Pyromancer's Cloak
  4. Runecarver
  5. Decapitator
  6. Demonic Embrace

Karthus Arena Build

Boots to start, then the items Karthus players build most often in Arena, most built first. Adapt the order to the lobby: every other team is an opponent.

Starting boots

  • Sorcerer's Shoes
  • Ionian Boots of Lucidity

Core items

  1. Rabadon's Deathcap
  2. Malignance
  3. Void Staff
  4. Shadowflame
  5. Liandry's Torment
  6. Blackfire Torch

Karthus Skill Order

The order Karthus players level their abilities in most often: max Lay Waste (Q) first, then Defile (E), and take Requiem (R) whenever you can.

  1. QLay Waste
  2. EDefile
  3. WWall of Pain
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FAQ

What are the best augments for Karthus in Arena?

On patch 26.20 Karthus players take Jeweled Gauntlet, It's Killing Time and ADAPt most often.

What is the best Prismatic item for Karthus?

The Prismatic items Karthus players pick most are Detonation Orb, Night Harvester and Pyromancer's Cloak.

What should Karthus build in Arena?

Start with Sorcerer's Shoes, then the items Karthus players build most: Rabadon's Deathcap, Malignance and Void Staff. Adapt the rest to the lobby.

What is the best skill order for Karthus in Arena?

Max Lay Waste (Q) first, then Defile (E), and level Requiem (R) whenever you can.

Is Karthus good in Arena?

On patch 26.20 Karthus is B tier in the Arena tier list: solid picks.

More B Tier Champions

Arena tier list for all champions · Karthus in ARAM Mayhem

Champion names, art, items and abilities: Riot Games Data Dragon. Augment names, art and text: the game files. Hexgate is not endorsed by Riot Games.