This fragment of memory comes from Jian Yue's half-refined spirit body.
During that refinement, Ding Ling gained many benefits, acquiring the Sword Thought Spirit Tempering Technique, which turned his sword thought into a sword spirit out of thin air!
Besides that.
Ding Ling also learned many memory fragments from this refined spirit body.
Because the fragments are scattered and unformed.
Ding Ling naturally didn't observe closely.
But now, thinking about the Domain Crystal, those fragmented memories suddenly emerged with a related memory in his mind.
This deepened Ding Ling's understanding of the crystal.
"Only sword thoughts and sword souls that have existed in the Sword Realm for over a hundred years can receive the Sword Thought Spirit Tempering Technique, granted by the Sword Realm in some mysterious way!"
