Vaion’s chariot has the unique mod next movement skill deals 30-40% more damage. This interacts pretty awkwardly with channeled skills. It only seems to buff one tick/hit of the skill every 3 seconds(irrespective of if you actually hit an enemy or not). This also is an annoyance for build synergies such as Warpath+Void cleave or Maul Werebear as Warpath/Rampage consume the buff and don’t allow Void Cleave/Maul to benefit. This is also pretty much useless for any channeled movement skill as its only on one hit(the first tick) and not the entire duration.
So I think the Vaion buff should exclude channeled abilities.