When Hilda was chattering by his ear.
Zheng Qing was gradually starting to remember the results of that 'Firefly Transformation' project he mentioned — in the first semester of his freshman year, not long after he had entered the school, Zheng Qing had captured a Kappa Wild Demon during a night patrol at Lin Zhong Lake. Amidst the chaos of that night, the fireflies modified by Hilda left a very deep impression on him.
Unlike other fireflies, Hilda's fireflies were extremely sensitive to demonic energy; the denser the demonic energy, the brighter the light emitted by the fireflies. Conversely, the thinner the demonic energy, the dimmer the light. In addition, they could actively arrange themselves into neat formations for searching, ensuring that no suspicious targets were overlooked.
"I don't have Great Elf specimens to provide to those old men."
