In less than a day, he could already confuse a target's senses without speaking an incantation, making them see or hear information completely different from reality.
Half a month later, he could even confuse Black's and Lupin's senses when they were unprepared.
"I have to admit, even James was nowhere near as talented as this kid." Black looked at Gerald with an extremely complicated expression.
Lupin leaned against the window, a faint smile on his lips. "They're rather different. In his second year, James was still researching how to make his hair stand up automatically during a Quidditch match so the girls would give him a second look."
"Didn't you help him research that spell?" Black calmly twisted the knife.
"That was different. My interest was purely academic."
That day, Gerald had just left the Room of Requirement and was about to return to his dormitory.
After nearly two months of effort, he had finally more or less repaired the Vanishing Cabinet.
The spatial passage between the two Vanishing Cabinets had been reopened. First, he had sent a white mouse over from London. The mouse appeared in the Vanishing Cabinet in the Room of Requirement completely unharmed, lively and energetic.
Then he sent a toad over from this side. When Winslet opened the cabinet in London, the toad was in excellent condition too.
They tried many more times after that, and every test succeeded. Transporting live animals posed no problem at all.
Gerald still did not quite dare try it himself, though. After all, he only had one life, and he did not particularly want to take that risk.
Gerald planned to test it with pigs or monkeys next. If they could pass through safely too, the Vanishing Cabinet could officially be put into use.
Of course, it would be