Syndra's Scatter the Weak does a number of things that are a little hard to understand:
(Active): Knocks enemies and Dark Spheres back, dealing magic damage to them and any enemies they collide with. The distance of the knockback increases depending on how close the affected units are to Syndra upon cast. Dark Spheres that are knocked back also stun all enemies in their path for 1.5 seconds (source).
It's clear that enemies will take damage and also damage those who they collide with. It's also clear that anyone who has a sphere pushed through them will be stunned.
However, it sort of suggests that when spheres go through an enemy they deal damage. Does this damage scale with the number of spheres? Or is damage not dealt at all by the spheres, and they only stun?