C1728 Thundercloud immortal city treasury

Thunder Cloud Points were the proof of exchange for treasures in the Thundercloud Immortal City Treasury. One point of Thunder Cloud Points could be exchanged for one Middle Grade Immortal Spiritual Vein. One could exchange for a High-grade Immortal Spiritual Vein with 10% thundercloud points. Of course, Immortal Spiritual Vein were the most common and commonly used treasures