ok so apparently to be considered a "complete build" i gotta have 5000 words in this description. so ima tell you all abt his skills and stuff to have fun with :) feel free to disregard all of this. normally all karthus players choose the mid lane to start along with their Q attack, this is because you want karthus's ultimate as soon as possible. you get the Q ability 1st to allow quick harrasment so that when u level up once or twice when you get your slow and your aoe abilities you can just wreck the other midder. in team fights try your best to hang back at 1st so that you do not gett immediatly focused then turn on your aoe, place your slow in a strategic spot and then spam Q over and over and ulti when u either die (most preferred cause your focused like a mofo), or when everyone is running away with no health with luck you wil hear PENTAKILLLL!!!!!! thats pretty much what all karthus players are aiming to hear. i just got mega bored of this and found out this is only around 200 words so w/e like it if you want for me this build got me over 1000 ap and allowed me wreck even tanks. have fun! :) p.s. if your fed enough and you know your gonna win, sellyour boots and guardian angel and get 2 more archangels :) more ap= MORE FUNNNNN!