The letter is written in red ink, if it's ink at all.
"Dear Raphion,
I regretfully inform you that your friend and his wife have been slaughtered this morning. You no longer have any ties to the Alliance, and they shall no longer attempt to cause you to remain within the Alliance. Furthermore, in order to hide the specifics of the assassination, half the townfolk have also been slaughtered, which should allow you to remain safe here. Good luck with your little resistance!
 - Ryu"