User blog comment:Doeniel/Karthus, the Deathsinger Rework Ideas & Discussion/@comment-26459891-20151206074722/@comment-25368309-20151206164619

Yeah, I didn't feel like doing exequisite Math on the E, I was just like "reduce damage and costs" because both is so high atm. But of course you are right, he needs that damage to show his teamfighting presence, if I were up to reworking him I wouldn't just half everything.

And if I were up to remove his Magic Resistence Shredd the Q Damage shouldnt go down so much aswell, since Shred and Penetration are two completly different things.