Hogwarts: Harry Potter’s Return from the Witcher World96.71%

"What Are You Trying to Do, Potter?

Harry let out a sharp hiss as he took a deep breath.

"That familiar sensation…

Only this time, it was even more intense — like fire coursing through his veins. Magic surged wildly within him.

This was Thunder Potion.

A potion designed to enhance strength and agility during storms. But thanks to Harry's adjustments to the recipe, it now seemed to boost magical power as well.

Unfortunately, it wasn't a stormy day, so he couldn't fully test its effects. He could use a weather charm, of course, but his skill level wasn't quite there yet. While he could conjure a breeze or light rain, summoning a full thunderstorm was beyond his abilities for now.

Harry bottled the potion from the cauldron — three doses in total.

Then he grabbed a sheet of parchment and started calculating the cost.

Even excluding the failed attempts during his experiments, the ingredients for just these three bottles had cost over 200 Galleons. He'd gathered the Acromantula venom himself from the Forbidden Forest, otherwise the cost would've been even higher.

Harry sighed.

Good thing he had a generous godfather and some savings. Potions like these were incredibly expensive.

And this was only the first potion.

No witcher would rely on just one potion.

Within a week, Harry had developed a second potion — Killer Whale.

Originally designed to increase lung capacity, Harry had enhanced it using merfolk blood and gillyweed, making it far more effective.

After testing it himself, he found it allowed him to breathe underwater for three hours — without growing unsightly gills. He could move through the water as if it were air, completely unimpeded.

Harry spent hours swimming freely in the Black Lake, savoring the feeling of gliding through the water without aid.

But after Killer Whale, his potion development hit a wall.

The potion he most wanted to create, Blizzard, eluded him. Designed to enhance sensory perception, Harry struggled to find the right magical ingredients. He lacked suitable materials.

The restorative potions he envisioned — Full Moon, Owl, and Swallow — also proved challenging. He had unicorn blood willingly given, Horclump juice, and phoenix tears. But unicorn blood was so pure it neutralized toxins, which made it difficult to create a potion with the same potency as Thunder.

And the ingredients were outrageously expensive.

Phoenix tears were priceless. Half the vial Dumbledore had given him was already used up, and Harry was still figuring out how to get more.

Would phoenix tears still heal wounds if you made the phoenix cry on purpose?

As for unicorn blood, willingly given…

One ounce cost 200 Galleons.

Despite the price, it was always in high demand. News of a shipment could cause a stampede in Knockturn Alley.

Sirius had gotten into a fistfight with Snape to acquire a vial for Harry. He ended up bruised and battered.

It wasn't until Sirius told Snape the blood was for Harry that he finally got it.

Still fuming, Sirius later told Professor Flitwick he wanted to join Harry's summer study sessions.

By Wednesday, before Defense Against the Dark Arts class…

Ron was staring at his moon chart. "It's a full moon again… Do you think Snape will take over class?"

Hermione frowned, clearly conflicted.

She wasn't a fan of Snape's teaching style — half the lesson was usually insults, often directed at werewolves. But on the other hand, she knew that both Lupin and Snape were incredibly knowledgeable.

"Snape isn't so bad," Ron said, pulling two sheets of parchment from the floating textbook behind him. "I've already finished the essay for him."

Harry paused and spoke in a softer tone. "Ron, I might have bad news."

Ron froze. "Snape's not coming back?"

Harry nodded.

"Why?" Ron clutched his essay tightly.

"Polyjuice Potion," Harry said, naming a potion they all knew well.

Ron gulped. "So… Sirius?"

Harry nodded again.

"I trust Sirius," Hermione said slowly. "But… can he really teach?"

"You saw him during Christmas in the Forbidden Forest," Harry replied. "He was more at ease than I was. Trust him. He's a skilled wizard."

As they reached the classroom door, Harry pushed it open.

"Lupin" was already standing at the lectern.

Unlike his usual appearance, he wore a clean, plain lavender robe. His hair was neatly combed — a simple change, but enough to make him look strikingly different.

Ron couldn't stop staring. "Blimey… Professor Lupin?"

Once seated, Ron leaned toward Harry, whispering, "That's Lupin? Did Sirius mess up the potion? How does he look so… handsome?"

"His looks haven't changed," Harry reminded him.

"It's the way he carries himself," Hermione added.

"All he did was change his robe," Ron muttered, still in disbelief.

Harry opened his textbook and said, "Think about it. Sirius is handsome too, isn't he?"

Ron instinctively shook his head.

"Focus on his appearance," Harry insisted. "Don't let his antics cloud your judgment."

Ron frowned, trying to push aside memories of Sirius in his Animagus form, playing pranks with Fred and George, or getting into trouble with the centaurs.

He focused solely on Sirius's features.

"Oh?" Ron sounded surprised. "He… he really is handsome."

"Of course he is," Hermione said wisely. "He's Harry's godfather."

Harry shook his head. "Godfather and godson aren't related by blood."

"Oh…" Hermione's ears turned red.

Ron wasn't the only one struck by Lupin's transformed appearance. Every girl who walked into the classroom took a second or third glance.

Lupin had always been good-looking, but his shabby clothes and sickly complexion had masked it. Now, with a new robe and healthier appearance, his transformation was dramatic.

Hermione's fears about Sirius's teaching proved unfounded.

Sirius was a natural teacher. Or rather, he didn't see teaching as a job — he treated it like playtime with a group of younger kids.

The lesson began with identifying Swamp Diggers and how to distinguish them from ordinary driftwood.

But halfway through the class, Sirius's patience ran out.

He taught a simple, foolproof method instead: "When in doubt, blow it up. Use an Exploding Charm to blast every piece of wood you see. That way, no Swamp Digger will catch you off guard."

Seamus, naturally, loved it.

The Hufflepuffs were confused — it wasn't Lupin's usual teaching style, but it seemed effective enough.

At the end of class, "Lupin" was the first to pack up his things.

Hermione raised her hand. "Professor Lupin, you haven't assigned any homework."

The Gryffindors glared at her, but none dared challenge Hermione — especially with Harry sitting nearby.

"Oh, right. Homework," Sirius muttered, patting the desk.

Hermione and Harry both sighed. The familiar feeling was back.

"Hmm… never mind," Sirius said with a grand wave of his hand. "Practice is more fun than essays."

Harry coughed twice.

"I mean… let's do both," Sirius corrected quickly. "Write a three-inch essay on how to properly identify and handle Swamp Diggers — without just blowing them up. Due Monday."

The Gryffindors cheered.

Three inches? That was practically nothing!

The Hufflepuffs, however, were dumbfounded.

Sure, the essay was short.

But… dear Professor Lupin…

You didn't actually teach us how to handle Swamp Diggers properly!

On Thursday, after Potions class…

As the students packed up, Snape's cold voice cut through the room.

"Mr. Potter, stay behind."

The other students scrambled to leave. Some used levitation charms to haul their belongings out the door, continuing to pack up outside.

Hermione and Ron remained by Harry's side.

"Miss Granger." Snape barely spared Ron a glance. "I only asked Potter to stay."

Though the words weren't directed at him, Ron shrank back instinctively and started edging toward the door.

"We're heading to the library after this," Hermione said firmly. "I'll stay."

Snape's gaze shifted away. "Mr. Potter… you owe me an explanation."

"What explanation, Professor?" Harry's tone was icy. "I've submitted every assignment on time."

"If your brain hasn't rotted from alcohol, you should know what I mean!" Snape snapped, slamming his hand on the desk. "Black bought you a lot of potion ingredients!"