I'm looking for a word meaning being part of our mortal real world, and part of the fey/spirit world.
The moors are haunted by Sigwiff, an ancient witch cursed to the form of a wolf. Part ghostly apparition, and part shadowy manifestation, a _____ existence, trapped between this world and the other.
Similar to “crepuscular” in spookiness factor, and similar in that crepuscular can denote creatures that exist between the two worlds of daylight and night. Ideally not a mundane word, and probably a word of some heritage, but possibly fallen out of modern use. A little bit wanky.
I have explored synonym chains adjacent to ethereal, twilight, otherworldly, fey, metaphysical, unearthly .. to no avail.