Cap Kalista's E
Kalista's basic attacks only deal 90% damage in exchange for her passive and E-- while she effectively has no W and no R while away from her bonded partner.
If the burst of damage from her E is so strong that they had to make her the only champion in the entire game to not scale 100% on basic attacks, then the E needs to be capped far, far lower than it is at present. Probably somewhere around 10-15 stacks.
It's a little ridiculous that she effectively gives every single enemy ninja tabi for free from the start.