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It's December, it's getting colder, and Professor McGonagall has begun to collect a list of Christmas stays, and Field and Cedric still need to go back for the holidays. Pen | fun | pavilion www. ｂｉｑｕｇｅ。 info So they start preparing gifts for their friends early.

In the small club, Field was wrapping Professor Kettleburn's prosthetic leg in dragon skin, and the attentive Hermione laid her hand on the side, and the leg on the side was finished, and the surface was pitch black, because the dragon skin wrapped around the surface of the prosthetic limb was taken from the black dragon of the Hechdidi Islands. The dragonskins were obtained thanks to Neville, who overheard Harry when they needed to use protective leather to create a prosthetic for Professor Kettleburn. Neville volunteered to write to his uncle's family to ask for a number of black dragon skins, and Neville's uncle came from the McFasti wizarding family, who had managed the native black dragons in the Hehitiri Islands for generations, and had a lot of inventory.

By the time Hermione had sewn up the last piece of dragon skin, the prosthetic was finally complete. Looking at this pair of prosthetics that took a few friends nearly a month to make, they still have a sense of accomplishment, which is a very complex project.

At the beginning, Harry drew all the dozens of bones and connecting tendons separately according to the drawings given by Field, and then he and Rolf began to make models out of plaster so that Field could use them as a reference for shaping.

Ron, on the other hand, had to polish a layer of oak on the outside of the prosthetic skeleton for the arms, and also a layer of cork on the inside of the oak for padding, a time-consuming task that almost tortured Ron to the ground, and it was Harry and Rolf who helped him to complete the skeletal tendons before Field could shape all the bones and tendons.

Hermione was Field's assistant throughout the process, and she provided a lot of convenience for Field's preparations. In the end, Field left a lot of the work directly to her to do alone, such as the splicing of bones and tendons, and the gluing of oak arms.

Field was the busiest person in the project, and at the beginning he had to prepare for the shaping of the sound-absorbing steel skeleton and tendons, for which he needed to draw a powerful alchemy circle.

And for this alchemy circle, he spent all the spare time of three weeks, the alchemy circle needed to be drawn on the dragon skin of the Australian egg white, and the dragon skin needed to be activated before painting, and the configuration of the activation potion first took Field a weekend, so that he missed the Hufflepuff Quidditch match against Ravenclaw, the game was won very hard, and afterwards Cedric threw his light wheel 2000 to Field and asked Field to help him transform the runes.

Once the Activation Potion is configured, the Dragon Skin needs to be soaked in the Activation Potion for two weeks to allow the Dragon Skin to be fully activated. During this time, Field helped Cedric transform his broomstick. And Field also configured the magic ink to be used to draw the alchemy circle, of course, in order to make reserves in the future, this time Field configured a bit more.

During the two weeks of the dragonskin's activation, Field also designed two new sets of 'thinking circuits' for the pair of prosthetics, especially the part of the arm, which had a small change in each of the nearly thirty small 'rune words', so that every bone on the palm of the hand could move as freely as a normal person's palm.

It was almost the end of November when all the materials needed for the alchemy circle were prepared, and the metal conversion process after that was much simpler, and it only took one night to complete the shaping of the sound-absorbing steel skeleton tendons against the plaster model.

After that, there is the inscription of the 'Rune Language', this step can only be completed by Field himself, the content of the 'thinking circuit' is a lot, especially the many bones in the palm of the hand are very small, to engrave the entire content of the thinking circuit on each bone, it is not something that ordinary people can complete, thanks to Field's solid gold and stone carving process in his previous life, he can barely complete this work. It took Field a whole week to do this, and he couldn't finish assembling his arms and legs after that, so he had to leave it to Hermione, because his hands were shaking a little because of the continuous high intensity of the work.

The assembled prosthetic skeleton was a bit strange (see The Terminator), and Harry was a little creepy to watch, so the cork filling and oak arm bonding were quickly completed, and finally after Field and Hermione finished sewing the dragon skin, the complete prosthetic hand and foot were presented to everyone.

Field took the prosthetic arm and tapped one end of the prosthetic with his wand, and the mechanical prosthetic began to move on its own, and the movement of the palm of the hand, the bending of the arm was no different from that of a normal person's arm. After experimenting with the other leg in the same way, and having no problem at all, the friends began to cheer, and they hugged in turn, as if celebrating the victory of the Quidditch Cup.

"I'm going to give this set of prosthetics to Professor Kettleburn tomorrow, I think he'll love it, it's the best Christmas present. Rolf carefully packed the prosthetic leg into a beautiful box, which he had made specially for him.

In the hut in the Forbidden Forest, Hagrid was bringing Harry and the others some refreshments, and a jug of water was in the middle of the stove, and the heat was slowly warming the hut to ward off the winter chill.

Professor Kettleburn is bare-shouldered, and Field is carving a complex "Rune Language" for him behind his back, which is the master control part of the 'thought circuit', through which the entire mechanical prosthetic is controlled, so there is no room for sloppiness.

Coupled with the rune inscription on the leg, a full two hours later, Professor Kettleburn fixed his prosthetic leg by himself under Field's guidance, and began to carefully try to stand up, helping Field to the gate, the professor let go of Field's hand, and began to walk on his own around the hut. The thought circuit' reacted faster than the normal leg, so the professor fell on his own several times, and after half an hour Professor Kettleburn adapted to the reaction of the mechanical prosthetic, he was able to walk as fast as he flew.

"Oh, thank you, little ones, I haven't run this fast in almost thirty years, it's so nostalgic, and now I really want to find a place to go on an adventure, maybe I can go to Newt. Hahahaha," Professor Kettleburn laughed and hugged Field.

"Professor, how are you feeling?" Hagrid asked, looking at Professor Kettleburn, who was still limping along.

"It feels great, Hagrid, just like his old hands and feet, and even faster, so I need to get used to it. Professor Kettleburn said excitedly, waving his new arm.

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