Move the slow from Kalista E to her Q
I'll be really honest, i don't like Kalista Q, it's just a spear.
Second, The Slow on the E is a bit cancerous, E should only be about staking spears and then press E for massive damage.
The current kit of Kalista offer no syndergy between her spells, because Q is not needed at all, it's jsut a longer skillshot but thats it, all the work is done by Right click + E (cause ti slows)
So instead Kalista would be a lot more funnier to play ( and helthier) if the slow is on her Q instead. So now we have a reason to land the Spear for the slow and then stacks the spear with the E.
See how the pattern works? i'ts a much more intelligent solution in my opinion.
Yeah you can debate it's a little nerf because the Q it's harder to land, but hey i think it's woth it