Yun Jin and his friends first established the sect and then sealed it with the demon clan.
They used themselves as seals to seal away the demons
Their scattered souls became others
One by one, they became Tianyan's direct disciples. From the time when the demon clan's seal was slowly released, to when Yun Jin (the clone) opened the killing array to protect them.
The swords Qingluan and Yunjin use together are the twin swords of flowing light.
Purpose: Write good novels