Just as Zhang Huaibing was undergoing the test of his weak spot.
In the pile of clutter in the interrogation room's corner, a tiny, inconspicuous trumpet-shaped goldfish eye lay quietly amid a heap of bloodstained rags.
It did not give off the slightest energy fluctuation. As unremarkable as a pebble by the roadside, it could nevertheless transmit both the images and sounds from within the interrogation room.
Twisting copper tubes extended beneath the goldfish eye. At every bend in the tubes were lenses and Trumpet Mouths that refracted light and sound, continuing all the way deep underground.
This thing had a very plain name: the Optical Spy Mirror.
Meanwhile.
Inside an underground burrow more than thirty feet below, three gorgeous women and one huge fat rat were crammed together, fighting to snatch the other end of the Optical Spy Mirror.
The burrow had been painstakingly dug by the Demon Realm Burrowing Rat. Its location was extremely ingenious, directly beneath an armory.
Divine sense was already difficult to extend far underground. Even if the Yinsha Demon God's divine sense happened to sweep through this place, the chaotic energy fluctuations from all kinds of shells in the armory would interfere with it, making it hard to detect them hiding in the cave.
On top of that, the Demon Realm Burrowing Rat had used its spatial talent to conceal and fold the space. With this double insurance, they were even harder to discover. It had to be said that when it came to hiding its tracks, the Demon Realm Burrowing Rat was truly an expert among experts.
"That Yinsha demoness has such an amazing figure. She's so much bigger than me." As Wang Yingxuan watched, she transmitted her words to the other two, her tone dripping with disdain. "Senior Brother Huaibing really has