In the courtyard, a vigorous white-haired old man suddenly awoke, his body swiftly darting to the source of the disturbance.
"Nobody?" The old man furrowed his brow, appearing puzzled.
"Invisibility? Indeed a mysterious technique, but this old man has roamed the worldly society for so many years, what uncanny techniques have I not seen?"
In the next moment, he suddenly waved his large hand, and a ghost-like black mist instantly enveloped the area.
Wherever the black mist enveloped, even tiny particles of dust floating through the air were clearly discernible in his mind.
Soon, the black mist completely enveloped the area where the disturbance originated.
In the palm of the old man, a black sword had already formed, ready to obliterate the intruder upon discovery.
However, he quickly fell back into deep contemplation.
