What if Nasus' wither got a buff?
But I don't mean a straight buff. Instead of making it a single target point and click within a short range, let it function like Swain's Zone, slowing enemies caught in it after a brief delay. That gives it time for counterplay during 1v1 situations, helps it function out of 1v1 situations and prevents it from being such an awkward skill to use in the middle of a fight. Edit for clarity: The buff isn't a straight buff. You, as the enemy, would have enough time to leave the circle of affliction before it went off, but in a messy teamfight it would be more useful. Lower the duration or strength of it per unit hit even.