This race was once part of the original group of humans at the start of their existance, but they were seperated and found themselves in some unique caves filled of crystal and precious stones. The stones creates a hum that is undetectible hy human ear, so with time it changed their DNA stucture. They discovered that they had the ability to change form with a specific tune from a crystal. So they made special Ivory necklaces named them as Mercury Stars, when they hit the pendant they can change form. The disadvantage of such a change is that they gain a second personality type who knows of the other personality but is unable to know what the other thinks, they only remember what they have said or done.