Talk:Karthus/@comment-96.233.126.231-20120609235017/@comment-76.229.139.77-20120610183716

farm, farm, farm. harass if they get too close, but otherwise just focus on last hitting. your harass is NOT weak, if you can hit them single target it deals a lot of dmg. if they try zoning you, u might have to last hit with q, which has more range. NEVER use e to farm, it wastes mana and pushes the lane too fast. use it if any champs get too close, when they see that swirling aura around u they should back off fast. don't use w, save it for slowing anyone who tries to gank. when you hit lvl 6 tell ur team that ult is ready. if u see the enemy with low health, come in for the kill with w,e and endless q, r if they get away. ONLY if they have low health

start with boots+pots against skill shot champs, otherwise i like to take mana crystal+pots, to be built into early catalyst. catalyst will let you stay in lane MUCH longer to farm and take care of your squishiness until mid game, when you should build RoA and rylai. boots (to sorc shoes) are next priority, since like u said karth has low mobility.

i read a recent guide on solomid about the effectiveness of gp10 on AP mids. it seems like a good investment, so consider getting kage's