Ancient wizards return to Hogwarts.

"This meat is so cold!" Gryffindor picked up a piece of frozen, hard meat from the lunch box with his fingers and looked at it with disgust.

After the meat is cooled, all the fat will solidify on the surface of the meat. The barbecue will taste very bad and will be difficult to digest.

"Professor Gryffindor, it's winter. It's normal for the meat to be cold. Let's light a fire and heat the meat." Adrian came over with a pile of freshly chopped wood and piled it on the ground. A small pile of firewood and lighting them with magic.

"Get out of the way!" Mary, Gryffindor's favorite disciple, walked over carefully holding a horn cup, "Teacher, it's too cold, drink some mulled wine to warm yourself up first!"

Before returning to the camp, she carefully warmed the wine she brought with magic flames to keep it at a suitable temperature.

Adrian: (_)

He turned his head stiffly and found his teacher Slytherin standing under a pine tree not far away and smiling at him.

Adrian scratched his head: I'm in trouble now, I've finished the wine I brought with me on the way...

No, Mary, why are you doing so many fancy operation diagrams? So flattering! Wouldn't a great wizard like Gryffindor heat his own wine?

After despising Mary from the bottom of his heart, Adrian quickly swept away the snow on the ground and spread a piece of deerskin on the cleared ground. Then he ran to Slytherin and invited him over.

"Teacher, please sit here. This place is clean. Don't get your robe dirty."

After Slytherin took his seat, Gryffindor handed him the wine glass and gave him a sip of wine.

"Counting the two this morning, five fire dragons have been cleared away. There are too many dragons in this forest." Slytherin drank the wine in the glass slowly and began to talk. Lanfondo discussed the future development plan of the Forbidden Forest.

"How about leaving a few for the children? What if the little wizards in the future can't even deal with a fire dragon?" Gryffindor pulled out his long sword and skewered the piece of meat that was as cold as stone. , and then roast it on the fire.

"Teacher, leave it to us. It's just a fire dragon. I can deal with two... no, three!" Adrian, who was setting up a pot to boil water by the fire, heard the professors' conversation and came over. Spirit.

Mary glanced at Adrian, she felt that this guy was going to be scolded.

"How many times have I told you not to underestimate any enemy? Why can't you remember?" Sure enough, Adrian's words made Slytherin quite dissatisfied. He thought Adrian was too arrogant.

Ordinary fire dragons are okay, but if there are some giant dragons or dragons with rare attributes like space dragons hidden inside, this guy will probably die directly!

"Okay, okay, the child's idea is good, at least he has courage!" Gryffindor actually quite agreed with Adrian's remarks.

Slytherin sighed heavily: he always felt that Adrian was an undercover agent installed by Gryffindor in his house.

He took out his lunch box, and after opening it, a rich aroma came out from inside.

Gryffindor sniffed, then looked at his old friend in shock.

"No, what the hell is this? Why is it so fragrant?" Then he noticed something unusual: "Eh? Why does your dish look so fresh? It's like it was just cooked!"

Mary and Adrian also came over to look at Slytherin's lunch box.

Sure enough, as Gryffindor said, the food inside looked extremely fresh, as if it had just been taken off the stove. The grease on the barbecue was sizzling, and the fried food wrapped in batter was steaming. When heated, it will make an extremely crispy sound when poked with a table knife.

"I studied with Helga for a while and came up with an interesting spell, and tried to put it on this lunch box. I haven't decided on the name of the spell yet. Is it called the Preservation Charm or the Warmth-Keeping Charm?"

"Why didn't you tell me about such a good thing?!" Gryffindor looked at the frozen ice lumps in his lunch box with extremely complicated emotions.

"You didn't ask, did you?" Slytherin responded with a smile.

Gryffindor was speechless by Slytherin's words.

"I'm teasing you, mainly because we have just researched this spell, and the effect is not yet stable, so I will test it with my lunch box first. This success is due to good luck. If not, maybe I just opened the lunch box. When the time comes, there will be a pile of food that has been roasted to char or rotten and smelly."

Although his friend explained it to him, Gryffindor was still unhappy.

He squatted aside and reheated the meat on the long sword. When he took the first bite of meat, Gryffindor suddenly realized and found the reason for his unhappiness: when he was experimenting with the crystal ball before, he was the first to find it. After you fucked me, when it came time to test the lunch box's ability to keep warm, it was you Salazar who tried it first, you didn't do that! Cunning, hateful Salazar!

"Try it!" Salazar took out some food and put it in Gryffindor's lunch box.

After the plump and juicy roast was in his mouth, Gryffindor's resentment towards Slytherin was instantly gone.

Slytherin's lunch box was attached with a traceless expansion charm, and the food inside was enough for four people, and everyone had fresh, steaming meals.

……

"This is the story of Slytherin and the preservation spell. Now I will teach you the key to this spell. After your lunch box is equipped with this spell, the food you put in will remain in the state of the moment you put it in. This is the realm of time. Super advanced magic!" After Les told Daphne an interesting little story, he started today's main topic: the teaching of stasis fields.

Ordinary preservation spells are nothing more than simple heating and freezing spells, which can keep food in a warm or frozen state, but whether it is continuous heating or continuous freezing will destroy the taste of the food, so a higher level of preservation magic It will turn the inside of the lunch box into a near-vacuum state and keep the temperature constant, but it still has its flaws.

Rice's stasis field is completely different. It has almost no shortcomings. The only shortcoming is that it is difficult to cast spells and consumes a lot of magic power.

It freezes time in a small area, allowing the items in the area to remain as they were at the moment they were put in. Until the spell effect disappears, the time flow rate around it will return to normal.

The time in that area was permanently "stolen" by the caster. It was extracted, exiled, and eventually dissipated into unknown space.

After listening to Les' introduction, both Daphne and Astoria blinked.

----

Here’s an update, the second update will be later.

Starting today, each chapter will be updated with an interesting picture - Hermione·Chinese martial arts style