A basic ghost can either be visible or invisible. The stronger they are, the easier it is for them to manifest into a visible spirit.
Spirits can be held off by a salt line, or pure iron. These will not hold off a ghost forever, only temporarily until they gain enough strength to manifest again.
Spirits could remain on the earth for a few reasons. They could have unfinished business, or they just chose to not move on when they died.
Angry spirits are born of a violent death.
Signs of spirits could include the following: unusual deaths, strange voices or noises, and sightings of the deceased.
How to destroy: Salt and burn the bones of the deceased.
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A Hunter's Guide to All Things and Beings Supernatural
FanfictionThis is the Complete Hunter's Guide to All Things and Beings Supernatural. In this book you will find descriptions, signs of, and how to destroy supernatural beings. Read carefully and hunt safely.