The unknown is the scariest part. Just not knowing who or what these ghosts are exactly. For example, the lady in white could be anyone from the past, and her story remains a mystery which is quite terrifying.
One major event could be his rise to a prominent position in his religious organization. This allowed him to have a greater influence on religious teachings and the community.
Some of the common themes in Ash Oaks Apprentice fanfiction are self - discovery. The apprentice is often on a journey to find out more about themselves, their powers, and their place in the Ash Oaks world. Another is the theme of nature. Given the name Ash Oaks, nature might play a big role, like the apprentice learning from the spirits of the trees or having to protect the natural balance in the area. Also, the theme of mystery, as there could be unsolved enigmas in Ash Oaks that the apprentice tries to figure out.
I don't know the author of 'gordon novel'. There are countless novels in the world, and this name alone doesn't provide enough clues. It might be a self - published work, or a book from a small press. Maybe it's a work in progress that hasn't even been fully released yet, so there's no publicly known author at this point.
It depends on the nature of the Gordon ghost story. If it involves typical spooky elements like sudden noises, apparitions, and a sense of dread, then it could be quite scary.