A bit of a pyromaniac (and possibly a pyrophiliac), Farnese's habit of impulsively burning things she did not like, along with her unstable mentality from her poor upbringing, provoked her to hunt down and burn supposed witches and pagans at the stake. This brought about a secret sadistic pleasure that she constantly tried to deny.
Farnese had tendencies towards setting fires, burning things she disliked, and harboring an unstable personality due to her upbringing. These actions led her to persecute supposed witches and pagans, providing her with a hidden form of pleasure that she tried to conceal.