@Zero Formation follows the movement of the stars and doesn't use the formation maker's essence, even if one isn't proficient in formation, a sufficiently high realm can allow you to notice that someone is making use of formations to move the essence of the heaven and earth.
That's why its a suspect whether this guy is really at the heavenly demon realm or higher, it might just be his techniques that has reach that realm and not himself which result in his techniques utilizing the essence in his surroundings to showcase terrifying power.
Or it might be that the author doesn't really understand what his doing while he's integrating both technology and martial art while making this making his head muddled as his focus right now leans largely on technology.
