Facing this powerful spell fueled by several dark wizards at once, Harry wore a brilliant smile. He flicked his wand and incanted, "Avada Lightning Chain!"
In an instant, a beam utterly unlike the standard Killing Curse burst from the tip of Harry's wand.
The Avada Lightning Chain looked more like a surging current—hissing and crackling in midair—as it collided head-on with the combined Killing Curse in a thunderous impact.
Light exploded everywhere. The violent magical shockwave spread like an invisible storm from the point of collision, surging outward in all directions.
Most shocking of all, in this clash of power, the advantage actually belonged to Harry's lone Avada Lightning Chain!
"How is that possible?!"
"No—push harder! We have to kill him!"
"Damn it… monster. He's a monster!"
The Killing Curse and the Avada Lightning Chain wrestled in the air for a moment. After confirming how effective the Avada Lightning Chain was in a direct magical contest, Harry gave a slight nod and then snapped his wand with force.
The next second, the balance at the collision point broke—and the intertwined beams surged rapidly toward the cluster of dark wizards!
The Avada Lightning Chain struck the first dark wizard. A shriek split the air as that wizard's soul was wiped out completely.
The others stiffened in terror, then—briefly—let out a secret breath of relief, thinking the horrifying crisis had finally eased.
But before that relief could even fully rise in their hearts, another change erupted without warning.
Blinding green lightning—like demon-serpents crawling up from the abyss—splattered wildly from the body that was turning to ash.
It was so fast that, in the blink of an eye, it swallowed every dark wizard in its path.
Only the strongest alluring witch survived—she used Transfiguration to raise an earthen wall in an instant, sealing herself behind it and escaping death. Everyone else had their souls annihilated by the Avada Lightning Chain!
In the end, the alluring witch stood trembling atop a pile of corpses, not daring to move.
Suddenly, a cloudy yellow liquid trickled down between her legs, sliding along her shaking calves and dripping onto the dirt-and-blood-stained ground, spreading into a glaring stain.
Her knees went soft. She could barely remain standing. With a trembling voice and a sobbing plea, she begged, "Little brother… big sis really knows she was wrong. Please… spare big sis!"
Harry answered with a gentle smile. "Don't worry, big sis. I know you didn't truly want my life. I've never killed women."
With that, Harry strolled casually toward the alley's exit.
Behind him, the alluring witch stared at the completely unguarded back he'd left her. The sweetness on her face vanished, replaced by a flash of vicious cruelty—she was about to strike.
At the critical instant she launched her attack, something went wrong!
A gigantic hand—several meters across—burst up from beneath the soil. Before she could even react, it engulfed her along with every corpse on the ground.
The massive hand clenched.
A sickening crack of shattering bones and the dull, wet crush of compressed flesh filled the air.
Streams of blood seeped out between the stone fingers like winding rivulets, staining the ground with a horrifying smear.
In the blink of an eye, everything returned to silence.
The rock hand slowly relaxed, sank back into the earth, and vanished—taking the dark wizards and the alluring witch with it, erasing every trace as if they'd never existed.
Not far away, Harry didn't slow down. The corners of his mouth lifted slightly as he murmured, "Spell test—complete."
——————
After Harry's first successful test of the Avada Lightning Chain, Knockturn Alley became his go-to testing ground. Every few days, he would make another trip.
The first two times were calm enough, but once he visited more often, the sharp and treacherous dark wizards of Knockturn Alley immediately sensed something off.
By the last time Harry went, he had disguised himself carefully—head lowered, shoulders deliberately trembling—looking exactly like a timid young wizard whose heart was being squeezed by fear.
Yet even with a flawless act, those dark wizards who lived in darkness year-round still reacted like beasts sniffing danger—instantly alert.
Whenever they saw him, they scattered like startled rats, keeping their distance and not daring to approach.
Watching that, Harry felt helpless.
He understood: his testing had made the dark wizards of Knockturn Alley extremely wary. Under those circumstances, continuing the tests was no longer possible.
With no other choice, Harry could only pause the testing.
Still, with the "help" of dozens of dark wizards, he completely finished the Avada Lightning Chain. This version could expand the Killing Curse's target from a single individual to more than a dozen at once.
That leap was, without question, a bold innovation over traditional magic—and it massively improved work efficiency.
Beyond his breakthrough with the Avada Lightning Chain, Harry also made new progress in his research on potions and mental projection.
For mental projection, he had already found the right approach. Once he returned to the multiverse world, he would be able to rely on the technology there to achieve mental projection—and then embed the lending system directly into a borrower's soul.
And as for potions, he had made a shocking discovery.
As long as he used a fixed potion formula and brewed it together with chaos magic, he could produce a potion capable of granting others extraordinary power.
The potion formula he'd found so far, he named Assassin. After drinking it, physical attributes improved dramatically—sharper reflexes, greater strength, silent movement, talent for concealment, and the ability to slip through shadows to close in on a target.
Harry planned to use the Assassin potion as a foundation, then develop a complete system that could mass-produce "extraordinary" individuals.
He named it the potion system.
However, even the initial Assassin potion still wasn't perfected. This potion system would take a long time before it truly broke through.
After that, Harry accompanied the Dursleys for a round through Diagon Alley. He also took time to Apparate to Little Otter's place and build a portal inside their home. As for the last few days of Christmas break, Harry spent them being constantly clung to by Little Otter.
——————
The joy of Christmas break was like dazzling fireworks—gone in an instant.
The day before term started, Harry dragged his suitcase back to his dormitory.
When he pushed open the door, warm yellow light poured over him.
His roommates were already all there, their laughter bouncing and weaving through the cramped space. Only then did Harry realize—he was the last to return.
Ron sat by his bed packing his bag. Hearing the door, he said sourly, "Oh, Harry, you're finally back. Sounds like you had a great Christmas break—unlike me, stuck all alone."
Harry felt a little awkward and tried to change the subject.
Just then, he noticed a beautifully wrapped parcel placed on his bed. He walked over, puzzled. "What's this?"
It was wrapped in dark green velvet paper, tied with a crimson ribbon. Under the dim lamplight, it looked especially eye-catching.
Clearly, it was a Christmas present.
His friends all knew he'd gone back to the Muggle world for the holiday. Before, they would send gifts straight to the Dursleys' house.
So who had sent this one?
Ron shrugged, utterly baffled. "No clue at all. That day I woke up, opened my eyes, and it was just lying there on your bed. Hurry up and open it—I'm curious what it is."
Harry opened it. Inside was a silvery, shimmering fabric. It felt strange in his hands, as if it were woven from water.
"It's an Invisibility Cloak," Ron said, eyes bright with excitement. "I'm sure of it. Put it on—try it!"
Harry draped the cloak over his shoulders. Ron shouted, "It is! Look down!"
Harry lowered his head. His feet were gone. He went to the mirror—inside it, only his head floated in midair. His body was completely invisible. When he pulled the cloak over his head, he vanished entirely.
"There's a note!" Ron suddenly said. "A note fell out from inside it!"
Harry took off the cloak and snatched up the letter. On it, in a long, thin handwriting full of little loops—unlike anything he'd ever seen—were a few lines:
"Your father left this with me before he died.
It is time it was returned to you.
Use it well.
A very Merry Christmas to you."
No signature.
Harry stared at the note in a daze while Ron kept admiring the cloak.
"If I had something like this, I wouldn't need anything else," Ron said enviously. Then he noticed Harry frozen there as if lost in thought. "What's wrong?"
"Nothing," Harry said. It all felt extremely suspicious. Who had sent the cloak? Had it really belonged to his father?
The moment Harry's fingers touched the cloak again, a faint, strange ripple flowed through his fingertips into his senses.
His pupils contracted. Disbelief flashed across his face.
Attached to this Invisibility Cloak was an extremely hidden trace of dimensional magic!
It seemed to belong to some dimensional demon god—but that demon god's condition felt… off.
It seemed—underdeveloped?
Harry immediately thought of the legend of the Deathly Hallows: three gifts the Peverell brothers received from Death—three gifts that became the Deathly Hallows.
The Invisibility Cloak was one of them. Unlike ordinary cloaks, its concealment was perfect, never failing with time or magical interference.
Harry remembered that the Potter family was also a pure-blood family with a long history—so could it be that the Potters were descendants of Ignotus Peverell, one of the brothers?
Harry guessed that was likely, and planned to ask Dumbledore.
But just as he was about to move, something else completely seized his attention…
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