Anything extramundane exists beyond the everyday, physical world. Fairies, ghosts, miracles, and ESP are all extramundane.
Despite what it sounds like, extramundane isn't a way to describe something that's super boring! The word's Latin roots are extra, "outside," and mundus, "world," so it's perfect for talking about otherworldly phenomena. Over half of the people in Iceland, for example, believe in the existence of extramundane "hidden people" who are said to live parallel lives, unseen by humans. Things that can't be explained or documented within the material world are extramundane.