https://en.wikipedia.org/wiki/Redwall For a book series aimed at eight-to-twelve-year-olds, it has some remarkably... graphic scenes of torture and squalor and general suffering. My historian BFF and I are planning on writing a human AU fanfic and possibly a thesis comparing all the bad guys to various horrible shit the British Empire and other colonisers did. Also the slaver characters invariably get killed by their victims - one gets stoned to death by enslaved young children, another gets strangled with his own whip... It ain't subtle.