Karthus is an undead mage champion in League of Legends who excels at dealing sustained magic damage and impacting fights globally. His unique passive allows him to continue casting spells for 7 seconds after death.

Core Abilities:

Passive - Death Defied When killed, Karthus enters a zombie state for 7 seconds where he can cast spells at no cost while being untargetable. He cannot move or use items during this state.

Q - Lay Waste Creates a delayed explosion at target location dealing magic damage, doubled against single targets. Has a very short cooldown.

W - Wall of Pain Projects a wall that slows enemies and reduces their magic resistance when passing through it. Lasts 5 seconds.

E - Defile Toggle ability that deals continuous magic damage to nearby enemies. Restores mana when killing units.

R - Requiem After channeling for 3 seconds, deals magic damage to all enemy champions anywhere on the map.

Key Strengths:

• Powerful global presence with ultimate
• Strong sustained damage output
• Can continue fighting after death
• Excellent wave clear and farming

Key Weaknesses:

• Very immobile
• Requires precise positioning
• Vulnerable to assassins
• Ultimate can be interrupted during channel

Strategy Tips:

• Use Q to last hit from a safe distance
• Place Wall of Pain to zone enemies or aid escapes
• Time Requiem to finish off low health enemies
• Position carefully in teamfights to maximize Defile damage

Karthus excels as a mid or bot lane mage, using his long range abilities to farm safely while scaling into a late game powerhouse. His global ultimate pressure forces enemies to play cautiously when low on health.

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