This would make karthus tons of fun for me to play.

so dark harvest got karthus back into being viable sorta, i don't play him anymore but i've had this idea for a while to make him more fun to play now he's more viable (and still maybe gettign some kind of rework?)

music. that's simply it, karthus is all about his song, so why not put music on his passive and ult, other champions have this too (jhin for example)

imagine hearing the chaos of the harrowing when dying with a little bit of sadness at the end imagine an epic requiem when cahnneling your ult

this would make karthus tons of fun for me to play, and probably also for you.