В FCI брешут следующее
Цитата
Different tomes of knowledge disagree on the fi ner points
of these claims. The Black Scrolls of Ahm put forth the position
that individual souls seldom (if ever) become demons
incarnate, while the Demonomicon of Iggwilv actually lists
certain particularly evil individuals from history and outlines
what sorts of demons they became after death. However, the
Black Scrolls do allow for demonic pacts and bargains. Ahm
asserts that a particularly evil—and powerful—individual
can make a bargain with Demogorgon or Orcus, promising
to serve that prince faithfully in life, in exchange for
guaranteed rebirth as a powerful demon after death. He
does clarify that these demonic reincarnations appear to be
the exception rather than the rule. Still, no proof for these
arguments exists one way or the other, and most demons
enjoy infl icting doubt upon those who pursue this knowledge
too closely.
Whatever the case, the demonic life cycle is as unpredictable
as the Abyss.
В книгах по FR где-то что-то подобное тоже врут, но с ходу не нашёл.
Достоверных примеров не помню, собственно инфы по планскейпу, в общем, тоже.