Good Guide. this really helped me out, just got Karthus....thanks man

I did read your guide, but guides are made for new players and ones who are having trouble or want to improve, I don't believe it's the best build and so I downvoted it because of that, please stop commenting on my guide.

Funny how you say you didn't downvote but I have been keeping track of comments on this guide and yours happens the exact same time as a downvote, coincidence, I think not?! :D

I didn't down vote you my friend, but you did mine. And for your information i have had almost every game enough gold to build 2 RoA and AA Staff and Frozen Heart, you clearly dont know how my build works, you can spam your spell all day long farming like crazy, it would be nice if you would actually read through a build before down voting it. And then assume i was the one to down vote you when in fact i didn't vote on yours at all, i was simply asking why you down voted mine and don't say anything why. that in my opinion is very childish.

I have edited my comment to go into more detail but you shouldn't downvote builds out of spite, that is childish.

It would be nice when you comment on someone elses build to actually make a helpful suggestion and not just smash it. You can read my response to your comment on my build.

Thanks for the comments guys, your views and advice has been put in the guide!

Coming from a person who mains Karthus, there are a few things I don't necessarily disagree with, but rather I think would allow Karthus to do what he does, better.

The Archangel multiples are nice and all, but that gets extremely expensive, and unless you're fed to the point of stupidity, it's not likely that will ever happen in a game.

I can see where you're going with Frozen Heart. Might I mention though that if early and mid game your team's not doing too hot, Morello's is actually the better choice than Mejai's if you're having trouble getting stacks. You get good AP, nice mana regen, and of course the cd reduction. It's rather cheap, so it isn't hard to do.

One really big thing about this build that bugs me though is the lack of Zhonya's Hourglass. That makes Karthus really really useful considering people like to focus him first. Run into a crowd making them think you're stupid, pop defile, pop Zhonya's, and laaaaaaugh =D

Nice guide though. I like it. +1

+1

like to build a frozxenheart as well on karthus, seems to work out with archangels

not the way i would do a karthus, but spells are what i do, what you should try is 5 archangel staffs and a rabadons, my max ap on that was 1300. but a very well explained guide, good build, +1, keep up the good work man :D

Pretty good guide, nicely detailed.

I think you should replace Mejai's Soulstealer to something else, remember that 85% of the guide-readers are learning how to play this char and may have problems with survability ^^
But maybe it's allright.. you're focused on a nice build right? :/

Frozen Heart hmm... well, it's nice after a solid Ap build

+1, hope you can find the way to a great guide someday ;)

PD: Don't forget to take a look at my guide!