OC made unity (crystals).

I imagined that it wasn't Twilight Sparkle who created the Unity Crystals but a distant successor named Rayleigh Scatter.

Rayleigh was an earth pony with green eyes, yellowish fur, and wavy yellowish hair.

Her mother was a pegasus and a spectroscopist, physicist who studied electromagnetic waves. Her father from a family of corn farmers. Rayleigh was mostly raised by her father as her mother was away, being so busy with work.

Rayleigh did not have a happy life after she created the Unity Crystals.