for karthus lovers
NEVER TURN YOUR DEFILE OFF with this build ;)
but becareful when you escape from jungle tune it off.
sit back and ebjoy the AP
this is a jungler build.kill the dragon solo with your Q spell.while ur defile is on.
you gotta watch the enemy's health all the time becaz most of times ur teammates forget to tell you.slow them with W and GHOST and kill with Q and defile. if you missed them kill them with ult.
buy boots of switfness so you run faster becaz a slow karthus is feeder and you can slow abunch of enemies with W but it has a long cooldown so work on its placement.
DO NOT be in the center of a fight try to use lay weste in team fights from far and u may use your defile to harrass them. at the end of fight use your ultimate so you may get a kill.
ONCE YOU HAVE more than 1000 AP your defile can hurt as strong as fiddle's ult ;) and you just run accross the map and yu relized uve killed all minions.
if u add a spell vamp the baron is easily yours.
MASTRIES: try to put your points in to utillity and some in deffence but more utillity.
enjoy ,you are having the most minion kills and piss off the enemy with lay waste.