Just like a repeat of the orphanage incident, students from Gryffindor, Ravenclaw, and Hufflepuff suffered all kinds of vicious incidents one after another.
At least in Young Dumbledore's view, the mastermind and instigator behind these accidents was most likely Voldemort, the leader of the Walpurgis Knights.
However, he faced a situation similar to Mrs. Cole's, because Voldemort had done everything so covertly that he had no way to find solid evidence proving that Voldemort was responsible.
After Voldemort entered his fifth year, the vicious incidents also climbed to their peak.
He used his Parseltongue to open the Chamber of Secrets, not only killing Myrtle Warren, but also using that death to create his first Horcrux.
After the turmoil over Hogwarts's possible closure passed, both Voldemort and his "Walpurgis Knights" fell silent, and the various vicious incidents temporarily died down as well.
The only change on Voldemort might have been an extra ornament on his hand: a gold ring set with a black gemstone.
Dumbledore said, "That is the target of our trip..."
Vizet thought over the time interval in his memory. "Headmaster Dumbledore, was that a trophy Voldemort obtained during the summer vacation?"
"Yes..." Dumbledore replied. "I found the relevant memory from another person, but it isn't very complete. You'll have to wait a moment."
His voice and figure vanished together. In the blink of an eye, the surrounding scene changed from Hogwarts Castle into a house.
This house was even filthier than the Leaky Cauldron. The floor was covered in black, sticky stains, the ceiling was thick with spiderwebs, the food on the table had gone moldy, and the cutlery was crawling with rust.
Only one man lived here. His tangled hair and beard were like a mask, covering most of his face and making it impossible to tell