When Yaial crossed the Esadhu barrier to became a world, its blue light became the raging Heartfire, a violent star that would not last long, so it condensed and contained itself by growing crystalline layers of Farin, Boldid, Purdine, Mugia, and Vyal for protection.
The Heartfire infuses its power into the crystals around it-Farin is made most powerful as it is directly contacting the Heartfire, emitting a blinding white light and emanating a version of Heal. Boldid is next in power, able to still glow the Heartfire's blue Oranod glow in the presence of life. Purdines always give a soft faded green light, and Mugias do not glow at all. Vyal, while still precious and pure, are the least powerful, with no glow or added effects.