As I was reading through the file export_ancillaries I noticed a strange icon next to an ancillary that I then proceeded to look at... Heir Orb?
¬{heir_orb}Heir Apparent
¬{heir_orb_desc}The holder of this promise will inherit the throne of your Kingdom.
¬{heir_orb_effects_desc}+1 Loyalty
What is this, exactly? How does it work? Does it really dictate who becomes faction heir?! What will happen if I unlock this?