@Riot I fear that karthus is taking a bigger hit than you realize...
So right now, Karthus is sitting at a %50.2 Winrate at the moment, which to most people would seem balanced, but considering that not a lot of people play him, that %50 win rate might actually mean he could be underperforming compared to other mages. And after reading what Fizz Enthusiast said about how they're changing Thunderlords, (to where applying DoT and multiple hits on a spell like Karthus E for instance will only refresh the Thunderlords stack instead of adding more) I fear that it's going to get even worse for our resident Deathsinger. Not only have the builds that utilize Rylai's been nerfed, but this will actually hurt most of his other builds that go for both Max AP and CDR, which tbh is one of the better builds for him in the first place. Mostly because I often used the Ticks from his E to proc Thunderlords in the first place while I tried to land Q's on my opponent (which even with 45% CDR is still somewhat hard to do with that delay on it btw :P ).
I'm just asking, riot. Can we get a little something for Karthus to help him out?