Opening Flavor
Ancient Castle Ikana
The history of Hyrule-Termina
The ancient Kingdom of Hyrule-Termina was once ruled by the Ikanan Dynasty. King Ikana and Queen Termina once held all the lands in Hyrule. The Ikanan Royal Family, the Terminan Royal Family, the Garo Tribe, these were all wiped out in the bloody conflict known as the War of Ascension.
It was a war of liberation for the Hylian people, ruled by a distant and uncaring empire. But neither side was comprised solely of heroes. The tactics used were vicious. Assassinations were carried out, and campaigns of terror against civilians. Cities sacked, towns burnt to the ground.
Part of what turned the tide of the war was that the Hyrule faction, commanding the Hylians and their allies, found the Triforce of Wisdom, which allowed them to know the enemy's movements, and allowed them to spy on them and learn of their war plans. After the war, the remaining two Triforce pieces were found, the Triforce of Courage, and the Triforce of Power. Together, they were known as "The Sacred Triangles", or, "The Golden Power".
These Holy Relics left over from the Creation of the world, left by the Goddesses Din, Farore, and Nayru, were keys to tapping into the power of the goddesses.
This is how the world was created. I recommend watching this.
Before the world was created, there was chaos, shadow, darkness, and destruction only. A spiraling, swirling, black void, the absence of anything good or life-sustaining. In order to create a world with light, life, laws, morality, and justice, all of this chaos and destruction and shadow had to be contained.
When the Goddesses made creation, Din made the Earth. Nayru made the heavens, the Light, and the Law. And Farore imbued the world with Life. When they left this world, the Golden Triangles were left behind. Each Triforce representing the power of one of these Goddesses.
The Sacred Triangles
But there was also the Goddess Hylia, who ruled on high above all other Goddesses. And it was She who sealed the Darkness.
The Goddess Hylia
The chaos and shadow and destruction and darkness from before Creation, the Goddess Hylia sealed it away, trapping it inside of a gemstone, which was then shattered by the Goddess to prevent it from being unsealed.
The Unholy Relic
This gemstone, made by the Goddess Hylia, was more powerful than any Triforce.
In fact, only the power of all three of the Sacred Triangles combined were more powerful.
And the power contained within was pure evil.
The power of Death. The power over shadow and darkness and destruction. The power to unmake creation.
The Ancient Kingdom of Hyrule-Termina once held two of the three Shards of Shadow.
Fragments of the Gemstone that Sealed the Darkness, commonly known as the Unholy Relic.
It was not enough to prevent the destruction of the Ikanan Kingdom, or the massacre of their Royal Family, or the Terminan Royal Family.
But something of that Shadow remained, lingering, even in Death....
Anyone who once lived near the Castle of Ikana felt the effects of the shards of shadow. The power over Death remained, however faintly. And the King himself, his royal bodyguard, his soldiers.... much of the Kingdom... was preserved, even in Death.
The skeletons of those ancients still wander the halls of the Castle of Ikana. They roam the fields of Termina. They even extend as far as Hyrule field, where most of the great and bloodiest battles took place.
The armies of stalfos.... and re-deads.... and floating skulls.... and gibdos.... these undead remnants of the Kingdom of Hyrule-Termina, are still loyal to King Igos Du Ikana, whose remains are in Ikana Castle. But those remains do not lay still. And whatever remains of his soul has gone mad and wants only to destroy.
The armies of the undead are bent on destruction and death, and they are all animated thanks to just the slightest proximity to the shards of shadow, which hold but the smallest fraction of the true power of Death and Destruction, compared to the Unholy Relic.
Should this Relic be assembled, and its power unlocked, only madness, darkness, destruction, and death will follow.
And should this Relic be combined with the power of the Sacred Triangles, it would grant even a mortal bearer of this power nearly the same powers as the Goddess Hylia herself. Such a mortal would be nearly unstoppable.
The only counter to this power, comes from the Goddess Hylia. For although Goddess Nayru brought Law to this world, Hylia carries an even greater power, and an even Higher Law. Should the mortal bearer of the sacred triangles or the unholy relic be condemned and executed according to the Law, the Triforces and the Unholy Relic will not protect the bearer from Justice.
It is the Highest Law, from the Goddess Hylia herself: No one is safe from a just and lawful execution.
Present Day
King Igos du Ikana sent his undead soldiers all over Hyrule and Termina, seeking the Shards of Shadow. They were lost to him during the bloody War of Ascension.
Life in Hyrule and neighboring Termina has been peaceful since King Hyrule claimed the throne during the war, and assembled the 3 Triforces together. Peaceful and prosperous.
But just outside of Clock Town, a few kilometers away from Ikana Canyon, someone who traveled that road was attacked by a Stalfos, and just barely managed to fend off the attack. The stalfos had a sword, but no shield. In its bony hand, lay a small purple gemstone.
"A great gift, perhaps, as long as I don't say where it came from." they thought to themself.
But something about the gemstone was too precious to give away....
And they decided to keep it, suddenly feeling far more selfish than usual.
Elsewhere, across Termina field
Another denizen of Termina was traveling on business, and was attacked by a vuture that steals rupees because they are shiny. Acting quickly, this business person took out a pocket knife and stabbed the vulture, which then dropped all the rupees it was carrying.
"It must be my lucky day" thought this business person.
But among these rupees was a small purple gemstone.
"This should fetch a high price in Hyrule Market."
But the more this person looked at the shiny stone, the more and more drawn to it they were.
And the more corrupted by its power they would become.
In the Darkness
In neighboring Hyrule, Poe ghosts and shambling stalchildren littered the graveyards. Deep below the earth, a powerful undead creature held in its hands the last of the three small purple gemstones.
Now that the three gemstones had been found by three different souls, they called to one another, as if Evil itself desired to rise from its long slumber.
It would only be a matter of time before they were all reunited, and the power of Shadow would be unleashed on Hyrule.
Igos du Ikana sensed that a reckoning would come for Hyrule. His bony jaw lacked the flesh needed to grin... but his evil soul grinned all the same.
At last, the downfall of the Kingdom of Hyrule was at hand.
Igos could feel their presence, and sent his armies of the undead toward those who held the shards. Should Igos du Ikana reassemble the Unholy Relic, there may be no stopping his reconquest of Hyrule, and then the Kingdoms would be ruled by the power of Death, and all those left alive would be wiped out and turned into the undead.

In the desert
A man began his own quest for power, seeking the throne of Hyrule for himself.

In the forest
One of the keys to the Door of Time lay in wait....
and a fairy finally came to the Boy Without A Fairy.
In the mountain
One of the keys to the Door of Time lay in wait.
In the ocean
One of the keys to the Door of Time lay in wait.
Day One Will Begin Soon.