The seventh chapter of the Book of Kings told the story of King Solomon building the Temple. After the main structure was completed, he ordered a coppersmith named Roland to make a "Brazen Sea," which could be understood as a gigantic cup made of bronze, intended to hold water for ritual washing.
Ancient alchemy could roughly be divided into the esoteric period, the philosophical period, and practical alchemy. Alexander the Great was the founder of "practical alchemy." At that time, alchemy was not aimed at producing gold. Ancient Greek currency was primarily silver coins, and transmutation was the main purpose of alchemy in Alexander's era.
Although they had been protected by Dumbledore, the three Gryffindor champions were still given detention by Minerva. Their task was to help Filch clear out the growing number of Doxy eggs around the school.
If all those eggs hatched by winter, it seemed they intended to take over Hogwarts. After two days of cleaning, Kettleburn felt this was no solution. They had to find the Doxy queen. Worse still, there seemed to be more than one Doxy queen in the castle.
Minerva organized the student council to inspect whether students had secretly brought Doxies, Cornish Pixies, and the like into the school to practice spells. Even if it was too little, too late, doing something was better than doing nothing.
Advanced Potion-Making taught how to brew Pixie Palsy Potion, but it had limited destructive power against Doxy eggs. The eggs were covered in a layer of black shell, which could be used in Transfiguration-related potions, such as Waist-Cinching Potion. Drinking it could give one a dragonfly-thin waist.
The thin waist was a side effect of Waist-Cinching Potion. Its primary effect was to extend endurance. By the time it was invented, the fashion for corsets was