Cassiopeia is a powerful control mage who excels at dealing sustained magic damage through her poisonous abilities. Unable to purchase boots due to her passive, she instead gains movement speed per level and an extra item slot for late-game scaling.

Core Abilities:

• Passive (Serpentine Grace): Cannot buy boots, gains movement speed per level
• Q (Noxious Blast): AOE poison damage, grants movement speed
• W (Miasma): Ground and slow enemies in an area
• E (Twin Fang): Single-target damage, enhanced against poisoned targets
• R (Petrifying Gaze): Stuns enemies facing Cassiopeia, slows others

Ability Order:

1. Start with E for last-hitting
2. Max E > Q > W
3. Take ultimate at levels 6, 11, and 16

Key Strengths:

• High sustained damage output
• Strong self-peel with W and R
• Excellent late-game scaling
• Extra item slot advantage

Weaknesses:

• Mana-hungry early game
• Shorter range than most mages
• Requires precise positioning
• High skill cap

Best Matchups:

• Linear assassins (LeBlanc)
• Short-range mages (Sylas, Ahri)

Difficult Matchups:

• Mobile assassins (Zed)
• Long-range mages (Viktor, Syndra)

Core Combo: Q > Auto-attack > E > E > Auto-attack > E

The key to mastering Cassiopeia is managing mana early game while maintaining aggressive poison application. Focus on landing Q consistently before following up with E spam. Use W and R defensively or to secure kills on immobile targets.

Your late game revolves around positioning safely to output consistent damage while using ultimate and Miasma to protect yourself from divers.

Through proper ability sequencing and positioning, Cassiopeia can outscale most champions and carry teamfights with her high sustained damage output.

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