There were dilapidated Azkaban Prison
On Devil's Island, Sirius Black lay sprawled behind the dilapidated Azkaban Prison, consumed by regret.
Not long ago, the Mysterious Person had killed a batch of Dementors, nearly inciting a riot among them. Yet the people at the Ministry of Magic hadn't even considered replacing Azkaban's guards. They had only set up a number of magical devices around Devil's Island to monitor it remotely.
That had kept him from getting out for fresh air for days. If this went on, the Dementors would drive him mad too.
Fortunately, he had already worked out most of the surveillance coverage. Soon, he'd be able to avoid the cameras and go back to enjoying the sea breeze.
Just then, Sirius, transformed into a black dog, heard a rushing sound with his keen ears.
That wasn't the wind. Was it the sound of a Flying Broomstick?
Sirius sprang to his feet. Ministry of Magic officials wouldn't ride Flying Broomsticks to Azkaban.
He ran to a high point in Azkaban Castle, but there was nothing to be seen in the sky.
However, the Dementors on the island seemed to have noticed something. They were gathering in the sky from all directions.
Directly above Azkaban, Li Mu's memories began to flash back one after another.
Because of his Hyperthymesia, he never forgot anything he had experienced. As long as he wanted to, he could instantly recall and relive the joy and pain of events from more than a decade ago. At that moment, his mind was filled with happy memories of the best times in his life.
Expecto Patronum!
Li Mu waved his wand. A black phoenix took shape in the luminous mist spilling from its tip.
This was the Patronus summoned by the Patronus Charm, one of the oldest and most powerful defensive spells in the Wizarding World. Only a handful of Wizards could cast it, and only by focusing intently on the happiest, most wonderful moments of their lives. For him, though, it was as easy as eating or drinking.
He didn't need to concentrate. His memories could return to the happiest moments of his life in an instant.
That was how Wizards in this world worked. The power of many spells was tied to the mind.
A heart full of love made spells like the Patronus Charm far more effective.
A heart full of murderous intent made Dark Magic come as naturally as breathing.
That was why the Professional HuoZhong he had obtained was a Mind Wizard, not a Bloodline Wizard.
The black Phoenix Patronus flew toward the Dementors, driving them away wherever it passed. A Patronus was a Dementor's natural enemy. Until it reached a certain level of strength, it could hardly kill one, but keeping the Dementors at bay for now was no problem.
Li Mu began casting another spell: the Fidelius Charm, cast over all of Devil's Island.
This magic could hide a secret forever within a living being's soul. So long as the person entrusted with the secret—the Secret Keeper—didn't reveal it, even Dumbledore and Voldemort, the two most powerful Wizards in this world, would struggle to discover what the Fidelius Charm concealed.
The secret could be an event, an object, a building—or even an island.
The Fidelius Charm was difficult to master, and the greater the secret it concealed, the more power it consumed.
Even Dumbledore and Voldemort working together couldn't hide all of Devil's Island.
But none of that was a problem for him. The Kindling Tome had let him instantly master the Fidelius Charm he'd obtained from Snape, while Spark Energy kept turning into Magic Power, leaving him with an inexhaustible supply. If he couldn't hide the entire island all at once, he'd do it in sections.
It took no more than a few minutes for the Fidelius Charm to cover all of Devil's Island.
The secret was hidden in the Werewolf Wizard's mind, and he had already been stored inside the Phoenix, so there was no possibility of him revealing it.
So even if Dumbledore came now, he wouldn't be able to set foot on Devil's Island.
Li Mu didn't rush to hunt down the Dementors. Instead, he kept casting spell after spell at them.
His Wizard Bloodline was about to level up.
Unlike the Wizards of this world, whose bloodlines were fixed at birth, his Wizard Bloodline had a low starting point but a frighteningly high growth ceiling. The more spells he learned, and the higher their levels, the faster his Wizard Bloodline grew.
Thanks to the Kindling Tome, he had already mastered a vast number of spells.
Now all he had to do was cast them through his Wizard Bloodline, stimulating it to grow.
After less than half an hour of spell bombardment, his Wizard Bloodline had reached LV2.
Li Mu kept going, paying no attention to the Wizards flying past overhead near Devil's Island. The Wizards who had come from the British Ministry of Magic couldn't see through the Fidelius Charm. As long as he didn't leave the island, he had no need to worry about being surrounded.
As time passed, the Dementors, who had been utterly dominated, finally realized how terrifying Li Mu was.
They began to panic and tried to flee Devil's Island.
They were all HuoZhong Source Power. Li Mu knew his spell practice was about to come to an end.
"Avada Kedavra!"
Li Mu flicked his wand and cast the Killing Curse, the most terrifying of all the Dark Magic in this world.
A flash of greenish-black light struck a Dementor. It left no visible wound, yet the creature's life was taken in an instant, as if Death itself had come with the Killing Curse to claim it.
Li Mu estimated that, amplified by his Kindling Wand, the Killing Curse dealt at least thirty points of damage.
That was with his Wizard Bloodline still at a low level and his Magic Power not yet strong enough. Otherwise, the Killing Curse's damage would have climbed even higher. No wonder it was considered the pinnacle of all damaging magic in this world, feared by every Wizard.
The Killing Curse was powerful, but killing the Dementors one by one was slow and costly.
Li Mu immediately waved his wand and cast another Dark Magic spell: the Fiendfyre Curse. The black Fiendfyre began as a small patch, but quickly grew as he continued feeding it Magic Power. At last, it formed into a flock of black fire phoenixes that swooped toward the Dementors.
Any Dementor that came into contact with the Fiendfyre was burned to ash.
It was far less notorious than the Killing Curse among Dark Magic, but only because it was difficult to hit a target with Fiendfyre and there were spells that could counter it. Setting aside the difficulty of landing a hit, its sheer destructive power surpassed even the Killing Curse.
In moments, every fleeing Dementor had been reduced to ash.
And the Fiendfyre that had burned them didn't diminish in the slightest. On the contrary, it grew even stronger after consuming the Magic Power within the Dementors. Li Mu was now in a bind: he couldn't control all the Fiendfyre anymore.
That was what made Dark Magic in this world so terrifying. The more powerful a spell was, the harder it was to control.
Without the Kindling Wand reducing spellcasting difficulty by 300%, he would already have lost control of the Fiendfyre.
"If I can't control it, then I'll stop trying."
Li Mu instantly released his hold on most of the Fiendfyre, and a rain of fire began to fall over Devil's Island.
Fiendfyre engulfed the entire Azkaban prison on the island. The prisoners held there without their wands had no way to fight it effectively. Most of them burned along with Azkaban, becoming fuel that fed the flames.
***
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