Not Updated For Current Season
The masteries shown here are not yet updated for the current season, the guide author needs to set up the new masteries. As such, they will be different than the masteries you see in-game.
My experience with my Build/Guid
I alway follow my build and got nearly ALLWAY good stats.
Mostly im overfeedet and deal much dmg, even to Tanks!!!
Rarely i fail becasue i have to fight one of the Champs you dont want to fight against (Point 3)
But i still deal good dmg.
If you are allready a good Karthus player and looking for a good build, here is it.
I promise that you will get good stats...when your mates dont fail to say Miss xD
GL & HF Summoner
I run Mejai´s Soulstealer becasue u get a few kills from your AND the side lanes.
When you reach lvl 6 u should have a Mejai´s Soulstealer because of ur Ulti.
Gettting easy some charges wich makes your mid-lane easier to play.
After that buy a Rod of Ages.
You have more HP and MP and also u get a bit AP.
In 1on1 fights its advantageous when u survive longer than your enemy.
Your Passive helps alot to kill him after he killed you.
Archangerl´s Staff give you enought mana and AP and becasue of that u schould it buy after you got ur boots.
I think the rest of the items is self-explanatory.
At the start : Framing!!!
its easy to kill minions with your "Q" spell and harvest gold.
Start killing enemy Champions when ur got ur Ultimate and/or Mejai´s Soulstealer.
Keep the enemy Champs away from your minions so he cant farm. Thats very easy with your "Q" spell.
DO NOT FARM WITH "E" because it cost to much mana. U can use "E" when there a very much minions but otherwise NOT!!!
I use Teleportation and Clarity for easy and nice farming.
Clarity: I use it becasue sometimes u have to fight your enemy Champ and so you burst down your mana (sometimes in mid of a fight) its very important to have all time Mana !!
Teleportation: if you die/go shpping/gank ore whatever u can easily go back to your lane and farm/ hold it.
Champions u wont fight against
Here is a list of a few champs u dont want to fight.
1. Veigar: Why veigar? becasue of his ulti. His Ultimate does more dmg even more AP you have and witch my buid u got easiely over 400 ap. The Ultimate will kill you faster then you can watch. My Tipp: By other items wich lesser AP or say your team to focus him.
2. Kassadin: Kassadins "Q" have huge range and makes you helpless. if you´re silenced... ure almost dead. You can´t hold him away from you when he reached lvl 6. My Tipp: try to haress and kill him before he gets a hight lvl.
3. LeBlanc: Hen she reached lvl 6 she WILL burst you down. "Q" and "R" will burst over 600 HP frok you also she can silence. Tipp:try to haress and kill him before she gets a hight lvl. PLaying devensive isnt a good idea. Shes Faster and can port.
4. ??? If you know someonewho makes you problems tell me ^^