Inside Hagrid's hut, Leo had just arrived not long ago when Hagrid took Fang to collect materials in the Forbidden Forest. Leo was alone, reading through alchemy books.
The book in his hands was an introductory guide to Alchemy. Once he mastered certain fundamentals, analysing that transformation pocket watch would be more efficient.
"Material transformation, magical power solidification..."
No wonder Alchemy was only offered as an elective course from the sixth year at Hogwarts. This subject involved Transfiguration, Potions, and even chemistry knowledge from the Muggle world—extremely complex and difficult to learn.
Fortunately, Transfiguration posed no difficulties, and he also had strong talent levels in Potions and Alchemy. Alchemy also mentioned magical power solidification, which had deep connections to semi-permanent solidified transformation in Transfiguration—studying them would be mutually beneficial.
So the transformation pocket watch loan, which required him to master solidified transformation or create an alchemical mechanical animal, could actually be seen as progressing together. Mastering solidified transformation would improve his alchemy, and studying alchemy would help him understand Transfiguration through comparison.
There were also Undetectable Extension Charms. Leo recalled Newt's letter contents, which mentioned that creating Extension Charm objects capable of housing living creatures also required certain foundations in Transfiguration and Alchemy.
This was only the simplest version, not involving the type that could contain multiple spaces. Creating a suitcase like Newt's was currently impossible to consider—that was practically a complete miniature world.
With mountains and water, capable of simultaneously housing large numbers of magical creatures even when their living environments were extremely different.
But he could create several simple containers and categorise things accordingly. Well, besides housing magical creatures for future observation, he could also build some experimental platforms inside for practising potions and alchemy... That way he could experiment anytime, anywhere, which would be much more convenient.
Time flew by quickly during his studies, and soon it was evening again. Leo put down his book and rubbed his somewhat sore neck.
"Time to get some exercise. Perfect opportunity to fertilise the Carnivorous Cabbages—there's still some Mooncalf dung left from last time."
After comparison, using Mooncalf dung as fertiliser really was more effective than his brewed potion fertiliser—those cabbages were growing much more vigorously. Unfortunately, the quantity was too small, far inferior to the abundant supply from brewing potions.
He had to specifically stake out those Mooncalves, and the yield depended entirely on those little creatures' whims. Once he made Undetectable Extension containers, he'd raise some Mooncalves.
"Hagrid! Hagrid!"
Just as Leo was about to get his small hoe, he was interrupted by sudden shouting. The voices sounded like Ron and Hermione.
"Bang bang bang—"
Urgent knocking followed, making the door rattle loudly. Leo waved his wand, and the door was pulled open directly.
Standing at the door were indeed Hermione and Ron, along with Harry. Leo looked at Harry and clearly sensed something wrong with him.
Harry's face was deathly pale, his lips had lost all colour, and he was clutching his left hand tightly.
Leo frowned: "Hagrid's not here. What's wrong? Why are you running here so late at night?"
Hearing this, the three exchanged glances, becoming even more panicked, while the pained expression on Harry's face became more obvious.
"What exactly happened?" Leo asked again.
Harry glanced at Leo somewhat guiltily—this look immediately caught Leo's attention. This expression looked very familiar—he'd seen it recently.
Yes, it was like when Harry had broken Malfoy's bones. Had this kid used potions on someone again?
He'd only taught him three potions these past few days: burn salve, beast-repelling powder, and Pepperup Potion... These shouldn't cause trouble.
Besides, it looked like Harry was the one who got hurt—had someone beaten him up? So why come here looking for Hagrid? To get the half-giant's help in a fight?
Wait, beasts—it couldn't be that yesterday...
Leo directly pointed his wand, and Harry's hand was lifted up, the sleeve sliding down. A wound extending from palm to elbow, torn and jagged, marked Harry's forearm.
The deep wound, visible to the bone, was seeping fresh blood that dripped to the floor drop by drop. This wound looked like a dog bite.
"Why didn't you go to the hospital wing?"
Faced with Leo's question, the three hemmed and hawed. Seeing their behaviour, Leo roughly guessed what happened.
It was probably following the original story's flow—the three had looked at Harry's father's history as a Quidditch Seeker, then while avoiding Filch's search, accidentally encountered that three-headed dog.
Originally they should have screamed and fled for their lives, but Harry might have gotten a taste for potions success last time and tried to replicate the operation. He'd thrown beast-repelling powder at the three-headed dog.
But this potion's principle was using strong irritating odours to drive away beasts. How was a three-headed dog an ordinary beast? It was a magical creature! Doing this would only enrage it!
As for why they didn't go to the hospital wing? Wasn't this just like when kids scraped their knees but didn't dare tell adults? They could only think to run to their friend Hagrid for help.
Leo was speechless—he'd taught Harry potion knowledge, but somehow it had caused him even more trouble?
"Wait here."
Leo quickly left the room and came to the concealment of the vegetable garden.
"Aurelius."
At Leo's call, the little Qilin directly Apparated in front of him. Leo took out a small bottle, aimed it at the corner of Aurelius's mouth, and had it turn its head to the side.
He'd read in books that Qilin saliva had very strong healing effects. Although that was about native Qilins, since Aurelius was a divine beast, the healing effects would surely be even better.
After Aurelius awakened, he hadn't had time to test this—but now Harry had run right into it.
After collecting a bottle of Qilin saliva, Leo sent Aurelius back to the Forbidden Forest and returned to the hut.
Using his wand to control the Qilin saliva, he applied it evenly to Harry's wound. At almost visible speed, new flesh grew, and the torn areas rapidly closed.
In less than a minute, the originally gruesome, frightening wound had completely disappeared without even leaving a scar.
Harry touched his forearm in disbelief, as if the previous pain had all been an illusion. Hermione and Ron also looked at Harry's arm in amazement, then at the bottle in Leo's hand.
"Leo, what's in that bottle? The effect is so miraculous?"
"Saliva."
"Saliva? What kind of saliva?"
"Fang's."
Leo said casually, not caring about their expressions.
"Now tell me what really happened."
Finally Hermione spoke up to describe the events, which were indeed much as Leo had guessed. When she mentioned Harry saying: "Don't be afraid, I'll protect you! Watch my beast-repelling powder!"
Leo laughed—he laughed in exasperation. It seemed his teaching still wasn't thorough enough. This was clearly a case of not understanding the material properly. Starting tomorrow, intensive training!