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This is for some people who want to be amazing with Karthus.
HOPE IT HELPS YOU :)
DO NOT BE THE FIRST ONE IN!
If they start to run ( which they will) this would be the time for WALL OF PAIN if you get them with it and your close enough use DEFILEand always use your LAY WASTE. If they are lucky enough to escape you and your team, use REQUIEMunless your near there spawn ... in that case just attack the Nexus. But if your not then use it and hopefully u will get some kills, ( and listen to people say how "noob" or "gay" Karthus Ultimate is ;) )
This will help you out A LOT with Karthus