Lun (also known as The Spellstone, Gurin-no-Magatama, or Lunstone) is a rare mineral that can be found on The Mainland. It is the only known substance that provides magical properties, including Animation, Transformation, and Law Variaton. Upon Awakening, it produces Spellmist, that allows other magical utilizations. In the Lotus Empire, people that can Awaken stones are called Alchemists, who are governed by the Grand Alchemist.

In nature, Lun has grey color, and it has similar properties to obsidian, but when Awakened, it radiates Spellmist, a green mist that quickly disperses unless utilized. The quantity that evaporates from the stone is negligible in short time frame, but when constantly used it exponentially loses its volume.

Lun isn't a substance that's fully understand yet by anyone, and the different peoples of the world have different theories on what Lun really is.

Humans that take notice of magic generally think the same thing that Shun He thought for most of his life—that Lun comes from the air. However, Shun's experiences on Moromah island are leading him to change his views.

The ruling clan of the enforce the view that Lun is the promethean gift of their emperor, the giant dragon slumbering inside Mount Moromah.

The dominant view among Dragovians is that Lun is the promethean gift of their emperor, the giant dragon slumbering inside Mount Moromah. Specifically, it is the tears he sheds for his people that contain the magical substance. The haughty Vahlok clan collects these "tears" in the streams coming off the mountain and uses it to dominate the other clans. As keepers of the Emperor's tears, they follow strict traditions when it comes to magic and prevent any further investigation.

The Bogovey clan was exiled from the rest of the Dragovians for questioning this orthodoxy. They believe they know the true nature of Lun. It comes from underground, and deep below the demongate on Krah, you can find the highest… and most dangerous concentrations of Lun.

The animals and spirits of the world don't think very much about Lun, besides just seeing it as a substance that's pretty much everywhere.