So Kalista is going to be nerf one way or another but....
I don't think she needs a damage nerf at all but a utility nerf
She is all about in-combat movement speed so disengaging from her (dashing,flash,ghosting away) should be a good option for shutting down her sticking potential(going in, jumping out then maybe go in with CC for the kill) yet getting away from her is just wayyyyy to hard with that rend slow why is it so strong 40% for 2 seconds why does she need a slow in the first place with that much movement makes it feel impossible to get away from her on top of her already good movement.
_So test the waters before you gut her damage (she is really weak when she gets behind and she falls off super late game making me to think its not about her damage that makes her oppressive its the over utility she has for 0 reason. _
Case and Point Remove the slow from Rend.
_I don't play kalista as much as I VS her so Kali mains let me know if you agree or if you think damage is her main issue _
(PS:Being the adc that has the best monster objective control is a nice niche to play up as well but honestly cap it at 1000 max so its still a toss up if a jg can steal from a kali and not just why should i bother its alittle on the invisibly-random utility side)