Years before, during the 15th century, Azkaban Island was not known to anyone, not even the British Ministry of Magic.
At that time, the island was inhabited by Ekrizdis, one of the dark wizards at that time. He was the one who constructed a fortress on the island, luring Muggle sailors there to torture and murder them. After his death, the various concealment charms placed on the island disappeared, and the Ministry of Magic became aware of the mysterious site's existence.
Ekrizdis was believed to have lost his sanity during his years of solitude. Other than the fact that the building was infested with Dementors, investigators refused to discuss what other evidence of Ekrizdis's activities they found within Azkaban.
The wizarding authorities of the time considered destroying the fortress, but, fearing retaliation by the Dementors, they decided against such action, and the Ministry allowed the dark creatures to remain.
The island was thus left unchecked for many years, even decades, until the International Statute of Secrecy was established.
In 1718, the Minister for Magic insisted on using Azkaban instead, seeing the Dementors as a potential asset. Putting them to work as guards would save expense, time, and lives. This plan was eventually put into motion and, despite protests, Azkaban remained the magical prison of Great Britain until the present time.
Voldemort descended from the sky, unaffected by the harsh weather. The violent wind caused his black cloak to swirl around him as he landed on the platform of Azkaban.
As he stood there, an eerie silence fell over the island. Even the crashing of waves was no longer a thing. Voldemort watched the entrance, covered in fog. A second later, a disturbance occurred as the fog began to disperse.
Out of it emerged a gliding, wraithlike Dark creature, cloaked in the same ominous darkness as Voldemort.
Dementors.
More and more emerged. Their ragged robes floated in the air. Their numbers were so great that the entrance looked more like a swamp of them.
As they approached, the temperature began to change into a chilling cold.
To any other person, seeing this, experiencing this moment would have caused them to be struck with fear. Some would try to escape, getting as far as possible from the Dementors.
But not Voldemort.
He stood tall and commanding.
"Faithful servants," he intoned, his voice cutting through the desolation, "you have declined here, feeding on the despair of mere prisoners. But I offer you a grander feast, a return to the days when you could revel in the abundant happiness of the living."
More attracted by the promise of greater sustenance, the Dementors appeared to be wavering in acknowledgment. One of them, perhaps the leader, conveyed the same sentiment in a gruff voice rarely heard. "We serve... if you provide more food."
Voldemort assured them, "With me, you will dream again of the banquet of human happiness. No longer shall you exist on the meager emotions of prisoners. I shall grant you the freedom to drink in the ecstasy of souls untarnished by imprisonment."
The Dementors, their allegiance sworn to the Dark Lord, awaited further instructions.
"For now, one of you shall accompany me," Voldemort declared, his crimson eyes narrowing. He extended his hand, and one Dementor detached itself from the others, floating towards Voldemort.
The rest went back inside.
Voldemort gave a last look at the tower before floating up.
He would be back here soon. To liberate his loyal Death Eaters. But for now, they had to wait a little more as he had another task at hand.
-----
In the village of Ottery St Catchpole in Devon, the night sky was very clear with the full moon clearly in the sky.
It was the 7th of July 1995.
There in the village was a house unlike any other. The reason was that it housed two very old people. Too old for anyone who has ever seen them.
The two old persons were the couple Nicolas Flamel, the French wizard and famed alchemist who was the only known maker of the Philosopher's Stone, and his wife Perenelle Flamel.
These two were known as the oldest wizards and witches to still be alive.
After leaving France, the two have been living a quiet life in the neighborhood of Muggles and some other wizards like the Weasley and Diggory. Most of their time was spent on potions or helping Hogwarts or the Beauxbatons Academy of Magic. Unknown to many, it was thanks to Nicolas Flamel's creation of the Philosopher's Stone and its ability to turn any metal into pure gold that the two schools have been able to function properly in terms of finance.
But their life took a drastic change in 1992 when Lord Voldemort tried to use the Philosopher's Stone to revive himself at that time. After Harry was able to stop Voldemort at that time, Albus Dumbledore took the stone back to Nicolas, and after discussing it, the latter decided to destroy it.
But he made sure to use the stone before removing it from Destiny once and for all. Nicolas made enough gold for the two wizarding schools to become self-sufficient and produce enough Elixir of Life to keep both himself and his wife, Perenelle, alive until he had taken care of all his remaining work.
Since then, Nicolas has been taking care of his leftover work. One of the habits that he got into was to leave every Friday for France and return very late at night, and the 7th of July was one such day.
Perenelle was alone at home, asleep, when she heard a noise. At first, she thought that it was her husband who came through the Floo network, but then she heard the noise again. She got up from her bed and stood still.
Was it a dream? She listened carefully. After the silence came the sound again for the third time.
This time, she recognized it as a knock on the door.
"Who can it be at this time?" she murmured and then thought that maybe someone was in need.