The Sol System was an improbable system in the Milky Way Galaxy. Life developed on a planet in that system, on a little planet, third from the star, that would come to be called "Earth." After a few billion years of formative events for the planet, it came to harbor life, which survived and grew and evolved, almost being wiped out a few times, but always hanging on by the efforts of a few species. Eventually, late in the planet's history, a species evolved in just the right way to acquire sentience, and began to spread across the planet. Those creatures eventually came to name themselves Homo Sapiens, or more commonly, Humans.

Humanity developed as a social species, defying the long standing, unspoken law of survival of the fittest, helping those who would otherwise die of defects or injury survive to reproduce and have happy, meaningful lives. They developed mastery over fire, and tools, language, agriculture, economics, and science. With these tools they set to tearing the universe apart to learn its inner workings, trying to piece together how the universe that created them came to be.

There were bumps along this road, however. War, famine, disease, bigotry, greed; all of these things sewed discord and destroyed progress, slowing down humanity's efforts to understand the universe. Wars were waged over resources to fuel the growth of a particular country, over misunderstandings and social blunders, over morality and the rights afforded to all humans. Through bloodshed and pain, humanity taught itself futility.

Mercury. The planet closest to the life-giving star of the Sol System. Once, it had been a barren, half-scorched, half-frozen rock. After the Traveler came, Mercury was transformed and made fertile, and it became a garden world. Once, Mercury had flowered with the life of photosynthesizing organisms. But no longer. A timeless evil borne of radiolaria and metal bodies, the Vex, emerged from the depths of space and poisoned the planet, transforming it into a computer to calculate reality. Now, in the present day, Mercury was once again a scorched desert, populated only with Vex and their strange, thinking architecture.

Venus. The second planet from Sol. Once a desolate husk with clouds of sulfuric acid, and a surface temperature far too hot for liquid water, and life by extension. The Traveler touched this planet too, breaking down the carbon dioxide atmosphere and rebuilding it, allowing the planet to cool and gain water. After that, flora emerged, making Venus a tropical jungle world ripe enough for fauna to follow. The Vex took interest in this world too, and seeded it with a subterranean complex for testing their prowess of ontology, in hopes of weaponizing it.

Mars. The fourth planet from the sun. Humanity looked at Mars with hope to one day walk upon its surface in hopes of finding life, perhaps intelligent life, to prove to themselves that Humanity was not alone in the universe. Unfortunately, Mars was just a little too small, its gravity not enough to keep its atmosphere from bleeding off in Sol's solar wind. With no atmosphere to maintain pressure, it too failed to harbor liquid water and life. When the Traveler came to Mars, humanity had launched its first manned mission to the Red Planet, the Aries 1, piloted by one Jacob Hardy. The crew expected to fly into thin, dusty atmosphere, but instead found themselves flying into a rising storm. After landing, the crew witnessed rain hit a several million year old desert. As with Mercury and Venus, the Vex took interest in Mars as well, and buried an entrance to the Black Garden, where they worship an unknown entity.

The Traveler, that being of Light and life, once it had brought life to the desolate locations of the Sol System, eventually settled on Earth, rejuvenating the planet and repairing the damage done by humans during their expansion across the planet. And like all things humans discovered, they set to work studying it.

Their successes in researching and studying the Traveler led to the proliferation of aerospace industries. With several worlds now habitable, humanity took to colonizing them, expanding into space. Mars became a bastion of science and engineering, a company known as Clovis Bray developing several key technologies and improving the lives of millions, and saving just as many. Venus became a scholar's haven, the Ishtar Academy and Collectives archiving all knowledge humanity had, and studying new fields with bleeding-edge technology. Humanity, with the Traveler and its Light, achieved a Golden Age. Lifespans increased dramatically. Several diseases and bigotries and outdated worldviews were eradicated forever.

But the Traveler had an enemy, a Darkness that had hunted it across the universe. Its armies, the Vex among them, soon encroached upon Humanity, forcing them back from their colonies and back to their home planet of Earth. In its final breath, the Traveler created Ghosts, living machines, to seek out those among the ancient dead who could wield the Traveler's Light as a weapon to fight back the Darkness.

Those first resurrected came to be called Risen. They were blessed with power, and the ability to come back from death, but not wisdom. The Risen came to acquire new names, each with their own contexts: Warlord, Lightbearer, Iron Lord, Guardian, Dredgen, just to name a few. But Guardian became the most popular. After Risen was Warlord. The Warlords ruled over the small villages and towns that survived the Collapse. They protected the villages from the Fallen, a race of space-faring pirates whose technology hinted at the Traveler's influence. In return, the Warlords had absolute authority. Often, Warlords would overstep on another's territory, and ended up causing petty squabbles that could level cities.

Eventually, those tired of those dark days founded a new faction, the Iron Lords, who would pave the way for the Lightbearers to unite in a single front against the Fallen and to protect humanity as Guardians. This led to the founding of the Last City, the City Beneath the Traveler, surrounded by the Titans' wall.

Now, a lone female Hunter, a Guardian, stood atop a stone cube above the sands of Mercury, overlooking a massive triangular Vex interplanetary gate. This particular gate led to the inner workings of the reality-calculating engine known as the Infinite Forest. The Hunter took a deep breath and leapt down, breaking into a sprint towards the gate. Though several Vex units tried to stop her, their shots didn't connect with their target. Her ship passed overhead, pulling her inside before thrusting forward into the gate.

On Earths moon, at the same time, a massive Vex unit dubbed the "Undying Mind" fell to a group of Guardians. This Undying Mind was the last of all realities calculated in the Infinite Forest, and with its destruction, the Infinite Forest hit an error never before seen by the Vex, nor anything else.

Deep in the heart of the Everfree Forest, a triangle of light opened up, and a tremor shook Equestria.

Author's Note

Hello yes, this is a Destiny crossover set just as Destiny 2's Season of Dawn releases. This prologue is to get those who are not familiar with Destiny up to speed on the absolute basics of the lore so that they can understand the story, or at least have a sense of what's going on. I'm going to try to keep things basic for those who don't play Destiny so I don't overwhelm them, but for those who do, I hope you enjoy what I'm going to be doing with these two universes.