Not Updated For Current Season
Why Mejai's Soulstealers?
Hmm at 6 lvl you have ulti and you should have a lot of frags = so many stacks = bonus ability power.
Why Sorcerer's Shoes?
Magic penetration is very important for this champion.
Why Archangel's Staff?
Archengel's Staff give a mana and ability power. You may have a truble with mana becouse Defile's needs a lot of mana.
Why Rod of Ages?
Karthus have little hp and he has to fast die. Rod of Ages give Ability Power.
Why Rabadon's Deathcap?
This hat give a lot of Ability power.
Why Abbysal Scepter?
Abbysal give Ability power and magic resist.