If you're terribly horribly horrifically worried, just make a little note before your first chapter/prologue saying that this fic contains witchcraft of a fantastical sense and necromancy. That way, people go in with an idea of what the fic contains, and people who are offended can back out of there.
Besides, it's as Giratina said, this is a forum based on a franchise that has magic of it's own (there is a canon witch from the anime I can think of) and other fantasy elements. I think you're covered. But the little note can cover your bases completely.