For questions regarding the non-magical supernatural phenomena. Questions about magic should use the "magic" tag.
The supernatural is that which exists (or is claimed to exist), yet cannot be explained by laws of nature. Examples often include characteristics of or relating to ghosts, angels, gods, souls and spirits, non-material beings, or anything else considered beyond nature like magic,1 miracles, etc.
1 Worldbuilding questions should clearly distinguish between the supernatural and magic. In other words, your question should be tagged magic or supernatural, but not both since magic is supernatural.