The Book of Spirit Crystals
There are strange crystals in the world, called Acid Crystals. Its crystals are born in dangerous places, often hidden in deep valleys of ravines, or hidden in high mountains and cliffs. Its color is different from that of regular crystals, clear and bright, and has extraordinary power.

In the past, there were brave people who heard the name of this crystal, and their hearts were longing for it, and they wanted to get it, so as to help themselves practice. Then they waded through mountains and rivers, overcome obstacles, cut through thorns, and searched for its whereabouts.

To a deep valley, the miasma in the valley was filled with poisonous insects. The brave are not afraid, and they move forward with their swords. Suddenly they encounter a giant python, who is entrenched in the road, and his eyes reveal a fierce light. The brave fight against it, his body is strong, and his sword is fierce. After a long time, he finally defeated the python, and only then did he enter the deeper part of the valley.

At the bottom of the valley, he saw a cold pool, and the pool water was dark and blue. The crystal was born on the boulder in the center of the pool. The brave was extremely happy, but the pool water was cold and piercing, and there was an undercurrent surging. The brave took a deep breath and jumped into the pool. Swim towards the boulder, and finally get Acid Crystals.

Holding the crystal in his hand, he suddenly felt a strange power pouring into his body, his body was comfortable, and his cultivation realm had a breakthrough. Since then, the brave has relied on this crystal to act bravely and become famous. And the legend of Acid Crystals has also spread endlessly in the world.