"This is... Han Shanshan's soul imprint!"
Mystic yellow azure flame was a special heavenly flame from the Firmament Ledger. While observing bone spirit cold flame, it had shown no reaction at all.
With Mystic Yellow Azure Flame's help, Chu Zhou had even peered into Bone Spirit Cold Flame's Origin. There, he discovered Yao Chen's soul imprint, along with a faint soul imprint hidden deep beneath the power of time.
Chu Zhou knew Yao Chen's past and the entire process by which he had subdued bone spirit cold flame, so he immediately guessed who that soul imprint belonged to.
Han Shanshan had been Yao Chen's teacher in name.
When Yao Chen was eighteen, he had temporarily assumed the identity of Dan Huchen's disciple and gone to the Pill Tower. During the grading test for Sacred Pill City's Pill Gathering, his distinctive alchemy techniques had caught the attention of Han Shansshan, who was already a high-level Seventh-Rank Alchemist.
At the Medicine Boy Pill Gathering, Yao Chen had taken first place with a sixth-rank pill of extraordinary quality. Han Shanshan had taken him on as her medicine boy, which was roughly equivalent to being a disciple, though he could also be considered an attendant rather than a personal disciple.
At twenty-one, Yao Chen had gone to the Fallen God Icefield with Feng Xian, now known as Venerable Feng, to search for heavenly flames. Worried about his safety, Han Shanshan had secretly followed them. She had saved Yao Chen when he fell into a nightmare, and the three had continued searching for heavenly flames together.
They had successfully found bone spirit cold flame, but it had proved unexpectedly powerful. Not only had it developed intelligence, it was also raising other heavenly flames as nourishment. To grow stronger, it had devoured Han Shanshan's soul.
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