Sorus Creation Lore

Asgorath, Dragon God of Creation existed in the First Void. There was nothing else in this void, and until Asgorath willed it there could be nothing else. Asgorath voluntarily shed some of his blood, which created the potential for other things to come into being. Only then could there be other gods and other creations. The Five Founding Dragons were the first to come into existence.
These Founding Dragons worked together to create a set of philosophies and ideals that would later take shape and become the natural laws that bind the Cosmos and facilitate its innerworkings. The philosophies set forth by the Founding Dragons are as follows:

• Law & Chaos - Velomachus Lorehold
• Good & Evil - Shadrix Silverquill
• Intellect & Emotion - Galazeth Prismari
• Physics & Logic - Tanazir Quandrix
• Growth & Decay - Beledros Witherbloom

The Five Founding Dragons created the cosmos and its crystal sphere, where they filled it with naught but primordial essence, the protoplasmic raw stuff of existence. Described as chaos and timeless nothingness, the sphere was filled with no more than dim misty shadows, neither light nor dark, for such things had not yet separated.
In time, Shar coalesced from the primordial essence, alongside her twin sister, Selûne. The goddesses were beautiful, identical but polar opposites, raven-haired and silver-haired, one representing the dark, the other the light in the manner of yin and yang. Yet they were so close they saw themselves as one being, known as the Two-Faced Goddess. They complemented each other and brought order and beauty. Together, they created The Material Plane, Sorus, as well as the other planes of existence. They infused these worlds with life, including many powerful beings that would later become the Gods that exist today. This universe was darkened by the hair and welcoming embrace of Shar and illuminated by the cool radiant face of Selûne.
Eons passed, and the cosmos prospered under an eternally starry night. The Age of the Stars, they called it. One day however, Chauntea, Goddess of Life and Agriculture, asked the Two-Faced Goddess for warmth. Chauntea sought to nurture all living beings with love and joy, and to provide a respite from the eternal dark. Then, for the first time, Shar and Selûne were divided, being of two minds on whether to end the eternal dark or not. The two goddesses fought over the fate of their creations. From the residues of these struggles emerged deities of war, disease, and death. Seizing an advantage, Selûne reached out of the cosmos altogether and into an unknown plane of living fire and, though it burned her painfully, brought forth a fragment of ever-living flame. She ignited a heavenly body—the Sun—in order to give warmth to Chauntea.
This greatly enraged Shar; she renewed her assault on her injured sister and began to blot out all light and warmth in the universe, while also threatening to destroy all mortal life. To protect the early life, Selûne tore out some of her own divine essence, though it nearly killed her, and hurled it at her sister. Selûne's essence tore through Shar, bonding with some of Shar's essence and pulling it loose.
This magical energy combined to form the goddess Mystra, the goddess of magic. Although Mystra was composed of both light and dark magic, she initially sided with Selûne, her first mother, giving her the upper hand. Mystra balanced the conflict and mediated an uneasy truce. Shar was cast into her darkness for millennia,enabling light and warmth to bathe Sorus and the other planes.
The battle left Selûne deeply wounded, and thereafter her power would wax and wane with the ages. Meanwhile, Shar, who'd retained much of her might, once again grew strong. Consumed with bitterness and loneliness, she vowed revenge and lurked in the darkness until her time to strike. The war between the sisters would go on forever more, but life struggled and flourished on the worlds, watched over by Chauntea, Mystra and the other early Gods.
However, unbeknownst to Selûne, when she brought the ever-living flame into the cosmos, along with it came a Seed of Elemental Chaos. The Seed grew over millennia, slowly increasing in size and power. This phenomenon continued unnoticed, until Elemental Chaos surrounded The Material Plane completely. From it, the elemental planes of Air, Water, Fire and Earth came into existence, and the four Elemental Lords were born.
Primordials spawned from The Elemental Chaos; god-like beings made of manifest entropy and elemental energy. These beings of pure chaos and destruction set about to eradicate all life. Thus began the Dawn War, an era where Primordials and Gods battled to the death on The Material Plane. The leader of the Primordials, Erek-Hus, King of Terror, killed many of the early Gods, and nearly caused a cataclysm that would have surely brought about the destruction of Sorus. Erek-Hus was so powerful, that Asgorath, Dragon God of Creation appeared for the first time in the world that he had willed into existence.
Asgorath fought viciously against Erek-Hus, but in the end, the primordial killed him by cutting Asgorath in two with his giant adamantine ax. The blow that killed Asgorath was so powerful that it tore Sorus into two halves: East and West Sorus. In doing so, the life essence that Selûne and Shar had imparted in Sorus was left exposed and unprotected, threatening the stability of the entire cosmos. Chauntea later sacrificed both of her arms to contain this life essence which became the two artifacts known as The First and Second Spark.
However, as no sooner Asgorath had died, his two halves rose up as the dragon Gods Bahamut and Tiamat, who joined forces for the first and last time. They killed Erek-Hus before the primordial had even a chance to celebrate his victory. Ashamed of her sin, Selûne retreated to an unknown location, where she would let the remaining Gods decide the fate of the cosmos. Deprived of the wisdom of Selûne, the Gods fought, each unable to overcome their own personal ideologies. And thus began the Cosmic War.