Backstory?

Long ago, there were twin mages, holding control over the elements of light and darkness. As the eons passed, the two continually oversaw the Earth from the shadows, protecting it from harm by controlling the elements associated with their element. However, as time passed, a rift began to form between the twins. Over time, the Brother of Darkness began to look into darker, more evil magic. Eventually, he fell into pure darkness, and waged war over the Earth he was supposed to protect. The Brother of Light had no choice. The two clashed, razing the land and changing the shape of the planet.

In the end, neither was able to defeat the other. The Darkness was run through by the Light, and vice versa. As the twins began to die, the Light knew something had to be done to preserve the power, and divide it up to prevent the powers from becoming too overwhelming. The forces the twins controlled was split up and divided all over the world, sealed within crystals and other such power. The power crystals containing the dead mages' energy has remained dormant over the years since, as humanity recovered and began building up again.

Now, the time for which the force to become active once more has arrived...