Idea for a small Karthus buff

Code his ult as single target (while keep it as is, full enemy team dmg) so he can proc full DFT. Karthus needs a buff, there are too many things that counter him right now. Redemption, Honey fruit, Locket, Zhonya, Edge of Night, spell shields etc. Let him at least use this one mastery's full potential.
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