When Vizet had been writing his manuscript, he had also used the assignments the professors had set as reference material.
As he thought about the professors' intentions in assigning those essays, he had unknowingly finished writing them all.
This meant that after sharing the manuscript with his dormmates, he could use the time on the train to do something else;
For example, based on the principles of the Dark Mark, and combined with his understanding of magical types such as War Magic, he could create a Communication War Magic of his own.
The basic magic used in the Dark Mark Voldemort created was the Cruciatus Curse;
It was precisely because the Cruciatus Curse served as the foundation of the Dark Mark that the Dark Mark could reach deep into the soul and be so difficult to truly erase;
When the Dark Mark took effect, Death Eaters would feel a searing pain like a branding iron, and that was also the Cruciatus Curse taking effect.
From the small one could glimpse the great. Through the design behind the Dark Mark, Vizet could sense that Voldemort possessed an extremely profound foundation in Magical Theory;
Without such a deep foundation, integrating the Cruciatus Curse into the Dark Mark while making it difficult for others to detect would not be simple at all;
By using the Cruciatus Curse as the foundation of the Dark Mark, Voldemort actually had another purpose as well: through the pain brought by the Cruciatus Curse, he ensured that the Death Eaters would always feel awe and fear toward him.
The fragment of Voldemort that had previously been imprisoned in the "Soul Guiding Box" contained a large amount of Dark Magic knowledge mastered by Voldemort, including Voldemort's understanding of the Cruciatus Curse;
Aside from that Dark Magic knowledge, Voldemort had