Radian.
A celestial city floating through the heavens, Radian was home of the God of Light, Chirac, and his many, many children. Alabaster stone had been his material of choice when he had conjured the world into being, giving the city the appearance of a world spun from white flame. As the circular rings of Radian progressed inward, they stacked higher and higher on top of one another, and more and more "impurities" appeared in the form of countless gemstones and pulsating veins of metal ore. Sat at the very center of the city was Chirac's own home: a great iron spire forged from the heart of a dying star. It reached upward, providing the centerpoint for the twin stars that constantly circled on the horizon. No sun ever set on Radian, and between the binary stars there was not one shadow. It was a paradise, just as he had created it to be.
Chirac had been born from the primordial light of creation shortly after it had birthed the universe he now rightfully reigned over. He had been born for a singular purpose: to fight back the unnatural cold and the dark, so that the universe would live and grow in its natural way. It was a never-ending war, and though the light had struck first in the form of the birth of all things, every day the darkness threatened to send it all back to its beginnings in the void. It was a rare time when he was not strategizing, healing his soldiers, or even fighting on the front lines against his sworn foe, but recently he had come across something new, intriguing in its possibilities. He had discovered that he was not alone. He and his dark antagonist were no longer the sole gods in existence.
But the rest were so small-minded. They had chosen to squabble and fight amongst one another for titles and shares of a literally infinite territory. He had watched them battle and found them... lacking. Instead, he had breathed life into the city, giving rise to a new generation of scouts born of Radian's very walls. Tiny little things, no bigger than hatchlings, but needing no more than a few stray sunbeams to sustain themselves. They had stretched their wings and shuffled their scales as they were welcomed into the fold, then scattered themselves like grain in the wind, seeking out these countless new worlds in search of allies in their unending war. He could feel each one, hear each of their thoughts and prayers as they told him of what they had found: new and infinite worlds, entire universes unguarded from or unassailed by the dark. New forms of life that had either been abandoned by their gods or left orphaned in the great battle of the heavens... new species and worlds that he would graciously bring under his wing, enfolding them in his protection before Baalchion's dark spawn could steal them away down the path of self-annihilation. For now, however, there was time only for reconnaissance, listening, and comprehending. Baalchion and the forces of darkness had fallen equally silent since the event that had ripped apart the firmament. Each side of the war was pondering their next move in the face of such monumental change to their perspective.
Chirac's form was as varied and flexible as he desired, but for the moment he rested in his most preferred shape: a great white serpent with golden eyes and wide, iridescent wings. He curled himself slightly tighter on his velvet bed, closing his eyes and letting out a long, hot breath. He smiled as he thought of the winding, whiplike aurora that extended out from the top of his spire from the mere act of his breathing ionizing the air above. It was his flag, his indicator to his children that their loving father was there with them in body as well as spirit.
As he let his awareness push outwards from the spire, he could feel every creature in Radian. Countless concourses of his children flew about the city. Some battled mock foes in preparation for the next battle, sharpening their claws and their skills at the same time. Others found themselves immersed in the pursuit of study. They occupied themselves cataloging and naming the new stars as they sprung up in the sky, each one a beacon of hope fighting to push back the black void a little farther into the edges of the cosmos. When a bright spirit was snuffed out or burst through the end of their life in a nova of glory, they would mourn a fallen juggernaut. When a star fell into dark perversion, seeking to draw in and annihilate anything it could reach, even cannibalizing its own kind, the scribes would be the ones to send out the word, warning away any creature of the light from falling into the trap. Still others simply went about their days in bliss, shimmering like gems under the twin suns. They would live, love, and grow strong under Chirac's care. Those closest to his spire almost never landed. The holiest of creatures, they bore the closest resemblance to their father, wyverns and other serpents that had no need for any limbs except their wings. As they pushed out further, the bulk of his children were the warriors, with two pairs of clawed feet and a single pair of wings. They were his beloved living weapons, channeling the light to breathe out fire and lighting on their foes. They were steadfast and impenetrable, his favored dragons. Near the edges of the city were those whose biology had specialized and adapted, growing extra limbs or shedding their godlike scales in favor of slippery skin or soft feathers, and trading their wings for the ability to burrow and fly through rock and soil. The drakes and wyrms were no less beloved, of course, but they were often brought low by their understanding of their deviance. From the edges of the city were the mists and jungles, an entire world created for the sole purpose of terraforming Radian's perfect environment.
And then there was one more creature he could sense, the singular being that he could not claim as his own creation in the entirety of this world. It was approaching fast, racing through the city in ever-smaller circles as it approached his spire. Chirac smiled and slowed his breathing to a halt. While he'd had little experience with their kind, he knew humans were fragile in the face of his sheer power. Even a wisp of his cosmic breath could leave her a walking corpse, unaware of her own death until the effects of her shredded cells had set in hours later.
A few seconds later, one of his scouts entered the room at high speed, followed close behind by their transdimensional visitor. The human stamped her foot in frustration as she skidded to a halt a few inches behind the tiny dragon.
"Man, I was THIS close!" she held her fingers a few inches apart, much shorter than the ACTUAL distance between them had been.
Chirac liked this human. Every color of the rainbow seemed to exude from her hair, a prismatic tribute to the spectrum of light. She was boisterous and forceful, and when she had first appeared she had nearly beaten one of his warriors on her own. She was empowered by an otherworldly force, an aspect of another plane that closely resembled Chirac's own power. She radiated her own light, resonating with a single pure tone that reverberated with each of Chirac's creations. It was a single, pure tone, but Chirac could tell that it was... incomplete. It was one of a set, of a harmony that was unfinished.
"Truly it was a race for the ages, Lady Dash..." the scout bowed his head to his opponent. Chirac smiled at the little dragon's humility. His scouts were created to explore the universe, they could travel as quickly as light itself. The little creature had clearly been holding back for her.
"I don't know what it is about this place, but I'm faster than ever, and it just gets better every day!" she jumped up and down before beginning to stretch her legs. "Thanks again for letting me stay here, Mister Chirac!"
Chirac raised an eyebrow. "It is you whom I should thank, Rainbow Dash. Your knowledge has proven invaluable in understanding the nature of these new worlds' boundaries."
"I REALLY don't feel like I told you much, but happy to help!"
It was amusing. Even just a few glances at her with his godly sight had revealed more than her strange story could have informed him of, though both had served him well in understanding what had happened. Barriers he had not even been aware of had been broken, and the cosmos expanded, and she was partially responsible, her and these "Elements of Harmony" of which she had spoken. Chirac could only hazard a guess from what he had observed of her own power, but they appeared to be some yet-unknown aspect of another world's iteration of the Primordial Light. And they had been powerful enough to restructure the order of the multiverse.
Chirac knew that, were he to command such a power, he could finally break his epochs-long stalemate with Baalchion bringing the light to every corner of existence.
"Please, until we find your friends, think of Radian as your home, and yourself as one of its citizens." He lowered his head, coming down to eye level with the human. She took the opportunity to seat herself comfortably across his muzzle, unable to even completely reach either side when fully reclined. "Now, perhaps it may aid my scouts if you describe your fellow 'Rainbooms' in greater detail..."