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Karthus powa ! All lines
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This build not prefered "only AP" style, but it contains moreover : Health, Mana, Mana Regen and Magic Penetration
Spell W i need only because it slows enemies and reduces their Magic Resist so I can spam spell Q
The second spell which I focused on is spell "E" but it devours to much mana
And the ultimate I improved when i could = LVL 6 , 11 , 16