User blog comment:Skeith9/Heroic Spirits Speculation/@comment-24754018-20140730213737/@comment-1458758-20140731023150

Yeah, the not existing thing seems to be it pretty much.

Still, back to the Zabaniya, I think it does work on physical bodies, it's just that when dealing with entities composed of Prana it becomes more efficient due to not having to break down a physical body. So it'd be a case where a skill is more effective in a battle of heroic spirits in place of human to human battle.