The sun, sometimes referred to in literature as Helios or Sol (from which the possessive form "solar" is derived), is a vast star composed of elemental fire and pure life energy not unlike that harnessed by unicorns. This celestial body forms the centre of our solar system, of which only four planets past and present have been identified: Noxtra, Somnustra, Lunastra, and the planet upon which Sapience resides. Many other planets are known to exist and have been observed by scientists, though their names and natures remain a mystery. Today, only Sapience's planet remains; the first three were destroyed in the saga known as the Eternal Night. Though the sun is thousands of times larger than our planet, its size pales in comparison to other stars such as the now-destroyed Ethian.
As a primary source of life energy and light, the sun is vital to nearly all living things on the face of the planet. Its warmth allows for the temperate climate that Sapience enjoys, and its light helps the various green plants of the land to thrive (including the Groves of Druids and Sylvans), which in turn feed other creatures.
The warden and protector of Sapience's sun is the goddess Mithraea.