User blog comment:Emptylord/Leaked Champion: Vel'Koz/@comment-24506340-20140204220558

I think they made the battlecast version of him and the other void creatures because Viktor got inspired by the tales of the destruction that the void creatures cause or he probably saw them in action in the Fields of Justice, so he built his own versions of them to fight the Resistance. Probably thats the reason all void creatures have a Battlecast or Mecha skin. Sorry for Bad english.