Chapter 175: Spirit Channeling It was impossible for any mechanism to silently move a massive, solid stone door to another location. This was a matter of physics, not metaphysics; moving something that heavy would inevitably make noise. With that realization, our previous "mechanism theory" fell apart on its own. But if it wasn't a large-scale mechanism, what else in a tomb could move a door without making a sound? He Yu sucked in a breath of cold air. "Um, Xiao Yao, let me brainstorm for a…