Four streaks of azure light shot forward as swiftly as lightning, striking the Blood-Colored Light Curtain almost instantly.
Boom!
A tremendous crash rang out from the Blood-Colored Light Curtain, and then the entire Blood-Colored Light Curtain erupted with an intensely dazzling red light.
Streams of Heaven and Earth Spiritual Qi descended, all absorbed by the Blood-Colored Light Curtain. As it absorbed more and more spiritual energy, the entire Blood-Colored Light Curtain began spinning at an unparalleled speed.
Hum, hum.
The Blood-Colored Light Curtain spun faster and faster, until a blood-colored vortex gradually appeared at its center. Traces of a decaying, icy aura seeped through the vortex, and a dim, desolate world could vaguely be seen beyond it.
At the sight of the blood-colored vortex, Danyangzi and the other three grew solemn. Each sent a stream of magic power into his azure Formation Banner, fully stabilizing the vortex.
Xu Yan watched curiously. Through the blood-colored vortex, he could already make out some of the scenery within the Great Yan Ancient Mine.
Just then, Gu Tianrong's aged voice rang out beside everyone's ears.
"This time, the opening of the Great Yan Ancient Mine will be extended to three months. Whether or not you obtain that Spirit Treasure, you must come out within three months. Otherwise, once this blood-colored vortex collapses, it cannot be opened again for another three years."
Xu Yan's heart tightened at those words. Before coming here, he had already learned a great deal about the Great Yan Ancient Mine.
Naturally, he understood the meaning between the lines of Gu Tianrong's words.
The Great Yan Ancient Mine was not an exposed mining site. After the Great Evolution Sect combined countless formations with heaven-and-earth might, it had become more like a secret-realm space.
The unseen Formation Spirit of the great formation