For void nerf, I think the best number to nerf it is 370, rather than 320
With 370, there are few interesting interactions.
For practical purpose, single means 1 target damage and multiple means 2 target damage.
Little prince, musky, and ewiz will survive 1 single and 2 multiple. I think this interaction is the main reason for void nerf to 320, and this can still be in effect if the void is 370
Little prince, musky, and ewiz will die to 2 single, this force a mind game to put unit beside said troop
Wizard survives 2 single, but will die from the 3rd beam
Phoenix dies to 3 singles, leaving an egg. With 320 ,phoenix will survive 3 singles which is not good since phoenix is hard to kill.
E dragon dies to 3 singles, other dragons can survive 3 singles
Archer queen dies from 3 singles, but can survive 2 singles and 1 multiple
I believe this interactions can and will make the void more interesting compared to 320 dmg for single