Karthus is a powerful AP mage known for his global presence and sustained damage output. His unique passive "Defy Death" allows him to continue casting spells after death, making him a constant threat in teamfights.

Core Abilities:

• Q (Devastate): Main damage ability and farming tool. Deals double damage to isolated targets
• W (Wall of Pain): Creates a wall that slows enemies and reduces magic resistance by 15%
• E (Annihilation): Toggleable AoE damage, restores mana on unit kills
• R (Requiem): Global ultimate that damages all enemy champions

Skill Order Priority: Q > E > W > R

• Max Q first for damage and waveclear
• Points in E help with mana sustain
• W maxed last as utility spell
• Take R at levels 6/11/16

Early Game Tips:

• Focus on farming with Q
• Conserve mana until Lost Chapter
• Look for isolated Q hits on enemies
• Coordinate with CC supports for kills

Optimal Team Composition:

• Works best as sole AP damage source
• Thrives with AD-heavy teams
• Excels at area control and sustained damage
• Global pressure with ultimate

Building Path:

1. Starting items: Doran's Ring + 2 potions
2. Rush Lost Chapter for mana sustain
3. Core items: Liandry's Torment, Shadowflame
4. Situational: Zhonya's, Void Staff, Rabadon's

Strengths:

• Exceptional teamfight damage
• Global map pressure
• Strong scaling
• Effective even after death

Weaknesses:

• Immobile
• Mana hungry early
• Skill-shot reliant
• Vulnerable to assassins

Play Pattern:

• Farm safely with Q
• Position behind team in fights
• Use ultimate to secure kills or assist other lanes
• Zone control with W and E in objectives

This champion excels at dealing consistent magic damage while providing global pressure through Requiem. Perfect for players who enjoy strategic positioning and managing sustained damage output.

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