ghostdom
The condition, state, or realm of ghosts or spirits; spirituality; spiritualism.
uncountable
I have seized the key that unlocks the mystic realms of ghostdom, and I will hold it as a flaming torch over that dark domain till its shadows have fled forever from the minds of men.
Where it comes from
From Middle English *gostdom, *gastdom, from Old English gāstdōm (“spirituality”), equivalent to ghost + -dom.
Adapted from the Wiktionary entry ghostdom (CC BY-SA 4.0).