A Nasus fix to end all Nasus updates.
Honestly his biggest issue right now is that he is absolutely useless in teamfights. Maybe if players blobbed up, and Nasus could somehow get them to split up...
Q does AOE at 250 stacks 25% damage at 250 stacks (for the aoe) 50% at 500.
Moving his abilities around Wither - slow removed for grevious wounds + a free stack. Spirit Fire - is now a slow that builds up.