"What Spiritual Treasure is your teacher refining?"
Yuanshi Tianzun was somewhat curious. He basically knew all of Master Tongtian's Spiritual Treasures; hadn't they already been refined long ago? Why refine another one now?
"Ah, it's like this. A few senior sister-apprentices and I were preparing to establish a Dao domain, so we searched the East China Sea for an immortal island. Through a fortuitous encounter, we found Mount Penglai. On Mount Penglai, we discovered the Primordial Measurement Ruler and the World-Purifying White Lotus. Knowing that these two Spiritual Treasures can suppress a sect's Qi, we presented them to our teacher. After accepting them, Teacher bestowed the Jade Immortals Sword Formation upon us."
Chapter 29