Koreanbuilds.net - Free Daily Updated League of Legends Karthus 12.23 Builds From Korea [LOL-KR]
Pro Karthus jungle path, S12 jg routes, clearing guide and build » Jungler.GG
Double Burn Karthus Build IS AN ABSOLUTE UNIT [60% WR!] | Karthus Guide Season 11 League of Legends - YouTube
What's the sub's opinion on karthus jungle? I decided to try it out (i never play karthus) and it worked pretty well. (i did the most dmg out of everyone with 70k