Two halves make One
Prologue
This happened thousands of lifetimes ago, when the beautiful lands of Hyrule were still at peace, its soil still pure and free of bloodstains from the Fierce War. In the young days of the Kakariko village, back then inhabited by a tribe of Sheikahs, life was joyful and simple. It seemed like ages since the last time Sheikanh warriors had to depart for conflicts on neighboring countries. Nonetheless, ever watchful and careful, the Sheikahs continued to teach their youngs the ways of battle, for the time could always come when once again, they would have to fight alongside the Hylians. For between the two peaceful races laid a sacred and noble alliance, of unbreakable bonds. Both people were long-eared, thus able to hear the voices of their holy Goddesses, and that was enough similarities for them to instantly consider each other as allies.
When exactly the Hylians encountered the Sheikahs for the first time is clouded and partially forgotten, but one knows that in exchange for a permanent home, the Sheikahs being forever homeless and straying, Hylians demanded to be protected and helped when in danger or at war, demanded they would serve alongside the Royal Family of Hyrule for the eons to come. Sheikanh and Hylian seals were exchanged, and soon the two sacred symbols were brought together as one throughout the plains. The Sheikahs were built and given a village for them to live and prosper in, named Kakariko, meaning 'Alliance' in the ancient Hylian language.
And never both people regretted having forged this bond, for a truly great peace and maturity lived amongst them. The Hylians were cheerful and brave, worth of trust and strong, while Sheikahs were thoughtful and agile, honest and righteous. Both people learned from the other, as Hylians were gifted with magical abilities that surpassed any other race. Their ease when handling swords, shields, spears and even bows was almost unsettling, and many of them even knew how to fight while horseback riding. Hylians' day-to-day business was conducted mainly during daytime hours, the coming of sunset announcing the time for sleep, thus their skin being tanned or reddened.
Sheikahs on the other hand, were very peculiar beings. More fast and agile than strong, they handled daggers, short swords, chain whips and poisoned needles with amazing accuracy. Their strange ability to hide perfectly in the shadows was astounding, and it seemed as though they could see right through people's lies down to the very truth. But it was the only kind of magic their kin seemed to possess. They lived mostly in the night and retreated at dawn to sleep, without exception, thus the obvious paleness of their skin. The average Sheikah was a bit taller than a Hylian, and less bulky in appearance. Sheikahs were lean and slim, lightly muscled and highly flexible, easily capable of doing all sorts of acrobatics even in less than good space conditions. Their hair was silver in color, ranging from dark to light, but never, ever of any other color. Bizarre, piercing red eyes they all had, from dark crimson to light orange-red. This intrigued Hylians like nothing else, for their people's eyes and hair came in a variety of colors, except silver and red. It felt as though Sheikahs were the complete opposite of Hylians, and still they were at peace, using those differences wisely to complete each other and become stronger.
Both worshipped the great Din, Nayru and Farore, but Sheikahs also devoted a deep cult to a force they named 'The Shadow'. They said it was the source of their abilities to hide and melt whenever there was darkness. When one was marked on the back with the Eye of Truth by The Shadow, it was then that they could be considered a true Sheikah, it was then that they became a part of The Shadow itself, being one with it and every other Sheikah that was also marked. True Sheikahs could easily be recognized, even when masked, by anyone; they had no shadows following them when there was light. This could only be proving the presence of The Shadow, but never Hylians could understand its role and place amongst their Goddesses.
It seemed like Hyrule was living in its golden age back then, its people happy, its seasons gentle and warm, its spirit untouched by the scars of war and treason…