"Scorching Sun Spirit Iron, Scorching Sun Spirit Iron..."
Jiang Ding muttered this somewhat familiar term, using his Divine Sense to search through his Sea of Consciousness, and sure enough, he quickly found the relevant information.
It was a memory of a Scorching Sun Swordsman from the Great Sun Sword Sect.
During the time at the Falling Void Sect's secret realm, the Scorching Sun Swordsman was defeated by Jiang Ding, and as the price for his survival, he handed over his memories that did not involve the Sect's taboo.
That included information related to the Scorching Sun Spirit Iron.
This was a treasure that circulated only among a few Immortals of Nascent Soul within the Great Sun Sword Sect and could promote the refining of the Nascent Treasure. One piece of Scorching Sun Spirit Iron could compensate for twenty years of hard labor.
As for the related secret refining technique, however, there was none.