Zhang Tie's gaze moved away from the plaque. He stepped forward several more paces until he stood before the two doors, then gently placed his hands upon them. The sensation beneath his palms told him that these metal doors, over ten meters tall, were actually made of Abyssal Demon Iron. Their material was no inferior to the Chaos Armor he wore. One had to know that even in Lion Fortress, equipment and weapons forged from Abyssal Demon Iron were reserved for knights.
The two metal doors were tightly shut and secured by locks, with manual bolts behind them as well. When Han Zhengfang had entered just now, he had completely locked the doors, essentially eliminating any possibility of others entering from outside.
But Zhang Tie was absolutely not included among those others. Beneath the Lotus Blossom Eye, the structure of the locks within the Abyssal Demon Iron doors appeared clearly before his eyes.
The lock on the doors was a Seven-Star Interlocking Lock, a top-grade advanced lock unique to Great Xia. Even with the key, one could not open it without knowing the method. This was because when the same key was inserted into a Seven-Star Interlocking Lock, there were seven insertion depths to choose from. At every different depth range, the direction in which the key was turned, the angle of its rotation, and the number of rotations all had to be exact. Only after seven consecutive stages could the lock be opened. Han Zhengfang had used the key to open it earlier.
Zhang Tie merely observed it for a moment, and the workings of the Seven-Star Interlocking Lock were already clear in his mind. Yet he did not act immediately. After drawing a deep, slow breath, he began making preparations before moving.
He took out the Gold-Devouring Dagger