Is it true that there's an eraser for the Death Note that can bring people back to life? While it was only mentioned one time in the pilot of the manga, one interesting detail about Death Note is that there was originally a way for the user of the note to reverse any of the deaths they carried out. Just as writing a name in the Death Note notebook would eventually kill a person, a special eraser existed that could not only physically get rid of the name written in the book, but even restore the life that was taken as well.
The Death Eraser appeared exclusively in the Death Note Pilot chapter, which isn't canon.

If the pilot chapter was considered canon several things would contradict themselves, like how the Rules of the Death Note contain that there are infinite number of pages in the Death Note, while in the pilot version it is stated that it has 60 pages with 38 lines per page.