A Kalista change that would bump her a bit upwards!
It's quite simple, give rend an extra AP ratio on top of the AD so that she makes full use of 
admittedly it already boosts her damage quite a bit but that bit of AP is seriously annoying.
It's quite simple, give rend an extra AP ratio on top of the AD so that she makes full use of 
admittedly it already boosts her damage quite a bit but that bit of AP is seriously annoying.