You find a magic notebook that can change anyone and anything, both mentally and physically, rewriting reality completely. The changes happen to reality itself, meaning that the past is changed. No one notices the changes. No one remembers the changes. No one remembers the old reality. The changes are permanent.

Note: A simple concept, but one I wanted to explore for fun, playing with different scenarios that could work as bots. There are plenty like it, but this one’s mine.