Can Such Things Be?

For by death is wrought greater change than hath been shown. Whereas in general the spirit that removed cometh back upon occasion, and is sometimes seen of those in flesh (appearing in the form of the body it bore) yet it hath happened that the veritable body without the spirit hath walked. And it is attested of those encountering who have lived to speak thereon that a lich so raised up hath no natural affection, nor remembrance thereof, but only hate. Also, it is known that some spirits which in life were benign become by death evil altogether. - Hali.