How to beat Karthus

Common role: Jungle / Mid

A scaling mage whose global ultimate executes low targets anywhere on the map.

What makes Karthus dangerous

Karthus spams Q for poke and farm, slows and shreds resists in his E aura, and his global ultimate hits your entire team after a channel — every low-HP member dies wherever they are. Even dead, he keeps casting for several seconds. He outscales almost everything if left alone.

How to play against Karthus

• 1Back before you're low: recall at 40%+ HP when his ult is up, or you die crossing the map.
• 2His Q hits harder on isolated targets — stand near minions/allies to halve it.
• 3Walk away from his corpse: the passive keeps casting for 7 seconds after death.
• 4Invade and end early — he's a weak early jungler and needs farm.

Weaknesses to exploit

• ✓Very weak early game, especially in the jungle.
• ✓No mobility and almost no CC — dives kill him for free.
• ✓His ult is countered by heals, shields and Zhonya's timed on the channel.
• ✓Needs items and levels — deny farm and he's a minion.

Abilities & how to counter them

What each of Karthus's abilities does — and how to play around it.

• P
  Death Defied

  Upon dying, Karthus enters a spirit form that allows him to continue casting spells.

  Strong: after dying he keeps casting free spells for 7 seconds. Weak: just walk out of his corpse's range — don't stand in the death zone.

• Q
  Lay Waste

  Karthus unleashes a delayed blast at a location, dealing damage to nearby enemies. Deals increased damage to isolated enemies.

  Strong: spammable poke that deals double damage to an isolated target. Weak: halve it by standing near minions or allies.

• W
  Wall of Pain

  Karthus creates a passable screen of leeching energy. Any enemy units that walk through the screen have their Move Speed and Magic Resist reduced for a period.

  Strong: a wide slow-and-shred wall that sets up his kite. Weak: pure utility, no damage — dash through or around it.

• E
  Defile

  Karthus passively steals energy from his victims, gaining Mana on each kill. Alternatively, Karthus can surround himself in the souls of his prey, dealing damage to nearby enemies, but quickly draining his own Mana.

  Strong: an AoE aura that melts melee attackers standing on him. Weak: it drains his mana fast — poke him while it's toggled.

• R
  Requiem

  After channeling for 3 seconds, Karthus deals damage to all enemy champions.

  Strong: a global nuke on your ENTIRE team after a 3s channel. Weak: fully counterable — heals, shields, Zhonya's on the channel; don't walk around low.

Itemization

Track his ult timer and don't walk around low. Heals/shields/Zhonya's answer the ultimate. Dive him — he has no escape.

This guide covers Karthus's core kit and playstyle — advice that holds up across patches.