The family line of magic. The magic started with the power of a mage.

The second accept her mother's powers that is sealed in the gem.

However the third one didn't. She wanted to live her life normal and for her future children.

Until tragedy strikes, the third one dead for an incident causing her first born to bare. She was given the necklaces but swore to never let her future use it.

And lastly, the fourth one bare a young daughter. She let the daughter inherit the power of the necklaces until she turns thirteen but she soon learn that her daughter faith came with the curse with the power.

The last child to inherit the powers was given a deal to a demon. She took to protect her younger sibling.

The curse of the powers was created by the mage that feel in love with a mortal and bare a child. Every generation, the first born must be a female ;however, if the first born was a male the curse well go to the spouse of the male baby.