it's really hard to read duo to bad grammar,no icons and stuff. also some tips are terrible,you need wards? you got your Q to reveal a bush,KS alot? if you fail you will waste your ultimate. he's not easy to learn,he is really hard and difficult because only his R is a good spell and his passive

Nah not good.

Please read Jhoijhoi's guide on Making a guide please :)

THX very much

THX wery much

I changed some caps, grammar mistakes, tell me where do U see mistakles and i will change them too, im really not a native american or GB, so i dont knw english so good

Yea i take Morello bcs its purple(i love that colour). But i like spamming spells so i need cdr. You can take any othe item for exchange to Morell or Void staff it u dont need it or u need something else. @http://www.mobafire.com/profile/thakinetic-151268, i told U upstairs! I take clarity for beginning of party. I like staying in my lane as much as possible since teleport has way too long cooldown. so i use it for lvling up faster.
I took those quints bcs it gives me 10 mag pen and i hate UGLY NUMBERS! LIKE 8.8 OR 9 or any else i have 10 mag pen(i have some tier 2 runes so i can have exactly 10 mag pen. im a fanatic as u can see :) ) So thats why i take them, only bcs i like full numbrs.
HF and all with Hfing.

i CHANGE SOME CAPS if u dont like it but that Caps are to mark out IMPORTANT stuff. u can buy wards but its supporters job! get soraka or sona for wards.
i told u why clarity, u need it at start,
Armor seals, bcs dps(caitlin) will not be able to do much dmg as she would be able to do without them at First blood. ur choice, u can use other summoner spells and seals but i love these.

i need to edit this build lil bit more. Thx for nice coments.
I know u like Hourglass! U can buy it as a substitute for void staff!
Rilay can be bought too as subst for void staff! IF THEY DONT STACK MR too much!
ask me if u need else, im ina a hrry im catchin a plane, so i will answer better and more detalied when i come back home! I gues for 23 hours. sorry for delaying answers.
GG GLL & HF ppl.
BTW. happy new year.

I have to downvote this one, sry :( Very hard to read alot of CAPS and Don't do that! NO wards? Kiddin'? Yes u can check bushes with Q but you won't be doing that all day long? It's 75 gold. 3-4 creep kills. Grammar errors, CLARITY? Karthus doesn't need this. Rly not. I can argue about some champs needs it, but not karth. If you lack so much mana just blue pill, teleport (Which you took). Or get your jungler give you Blue.

Don't take this as offense though, just telling that some things just doesn't seem logic to me.

You should also try to make this less colorful very distracting.

thankyou so much. You know how long its been since ive seen a new GOOD karthus guide. Karthus is one of my mains. I like the layout, and look of your guide and its very accurate. I do like how you take a 2nd point in defile at lvl 5 instead of just maxing out lay waste like everyone else.

I dont like how you split your quints To be honest I would go all flat ap quints or look into getting spell vamp quints.

Last I realize you cover stuff in your items section I just want to throw out what my build is: I like rylai's over archangels and to be honest I dont really like CD items on karthus and so i dont usually buy morello's. I Take either defensive item or abysal scepter for damage and magic pen.

All in all a very good guide.

+1