Talk:Karthus/@comment-4641298-20120402212727/@comment-4641298-20120403172042

You only need one mana item on Karthus. Karthus needs three things: AP, surviviablity, and mana. RoA gives you all 3, which is why it's so dam good. Gettingn a Tear/AA isn't bad, but I find it hard to squeeze it in a build. It's a really good item on Karthus (some of the highest base mana in the game + the way his Q works).