rework katarinas ult

its one of the weakest ults ever. like sure in the end of 2,5 seconds the very LAST dagger scales with 300% ap. but rest of the ult scales much lower and one cc is enough to ruin a katas thing. like fiddlesticks ult is still active if he gets stunned unless he is charging it up. like i got no chance as katarina vs a talon. because talon simply R R and Q and i die. its that simple. he does it in under 2,5 sec which is the duration of my ult. and i got no chance of poking him since he just jumps at me then. rework katas ult