Random Thoughts to Make Karthus Border line Broken

I'm on the toilet instead of class and a thought pops into my head. What are some things that could make Karthus Broken, yet not to far fetched. Not in any order

1. His Q was on a shorter cooldown
2. His Q would apply a 40% slow by itself
3. E % health missing damage as well
4. E would do % Max health damage
5. His wall would slow people and be useful
6. His ult would grant vision 7)His ult could not be avoided
7. His ult would execute instead of damage after a certain point.
8. Karthus would enslave the souls of those fallen around him and obey him, as he granted them Death and they saw the error of their ways and realize true happiness lies in death and everyone must learn of their ways, by force
9. His ult had a global VO