The serum

Why

the serum was created when King William the warlord was around, he had tons of daughters, who hated dark wielders as much as him, and one son, who secretly thought dark wielders were good people too, when the king found out he thought they used a serum on his beloved son, he asked all the chemists, doctors, and scientists to find the cure, the son who was filled with despaired hanged himself for the king didn't thought his way of thinking was natural, filled with distraught of his only heir was killed. Soon the smartest of the sister , Lillian, soon to be called Lillian the twisted, told the king of her plan to capture those who corrupted her brother and put a serum in them that corrupt them, the king looking upon one of his daughter as a beacon of hope told the scientist, the doctors, and chemists to make a serum called C.A.K., and openly announced that Lillian to be his new hair, but soon Lillian grew impatient
After a few years later she used one of her faithful sisters hunter knife slit her father throat and quietly when into her room, drop the knife, clean herself up, get in bed an scream and soon she executed her sister and became the new queen