Compared to Duke Tian Zhou's underground armory, the defensive measures of Duke Tian Zhou's Residence treasure vault were several times stronger.
Not only were its formations more profound and mysterious, it also had three layers of formations specifically designed to counter all kinds of divine abilities and escape arts. Yet before the Innate Five Elements Divine Evasion, as long as Ye Zhen was careful, none of that was a problem.
What gave Ye Zhen a headache were the four bizarre giant birds in the four corners of Duke Tian Zhou's Residence treasure vault. Their eyes were larger than fists, and they stared unblinkingly at every movement within the vault.
Ye Zhen recognized them. They were Ghost-Eyed Yin Sparrows, an exceedingly precious and rare species of bird.
Though these Ghost-Eyed Yin Sparrows possessed only simple intelligence, they were incomparably loyal and were the finest guards for watching over treasures.
The moment an outsider invaded, or any change occurred within the treasure vault they guarded, the Ghost-Eyed Yin Sparrows could immediately raise an alarm.
Even more troublesome, Ghost-Eyed Yin Sparrows were semi-spiritual beings. They needed no food and could survive solely on the spiritual energy of heaven and earth. Because they were semi-spiritual beings, they were also extremely difficult to deal with.
Right now, these Ghost-Eyed Yin Sparrows were the stumbling block preventing Ye Zhen from emptying Duke Tian Zhou's Residence treasure vault.
According to the Mirage Dragon Primordial Spirit, although these Ghost-Eyed Yin Sparrows were extraordinary, their combat strength was average. Ye Zhen could ignore them and forcibly take the treasures from the vault.
Even if Duke Tian Zhou could rush over at the first possible moment, Ye Zhen could absolutely empty the treasure vault and leave calmly before he arrived.
It had to be said, that was an extremely tempting