Ok took a quick look and I am not sure if it was deliberate or just got forgotten about.
VK centers around vitality scaling. every damaging skill the VK had gets vitality scaling. You give us a Smite note to turn it into void damage and then later in our passive give it Vitality scaling.
So how come Warpath doesnt get this stat swap as well? Honestly you gave it an interal node to change its base damage to void so why not give it one or mkae the same node change its stat scaling?
So tldr Vitality scaling for the void based warpath!