This was a replica of the Demon-locking Pearl, recreated during the time Cen Lizhui was investigating the Black Qi at the Immortal Sect, based on initial impressions.
To be precise, it was recreated with the generous support of Uncle Yun Chi, which specifically manifested as Yun Chi tossing a whole pile of Spirit Stones at Cen Lizhui for him to use freely. When Cen Lizhui took them, he realized they were the same ones he provided during the last Barrier creation session.
However, this Demon-locking Pearl couldn't lock the formidable creature that was the master of the Black Qi; it merely collected a small portion of its residual power while tracking the Black Qi.
For most people, this residual power remained harmless, and the purple substance that appeared in the previously transparent Demon-locking Pearl after encasing the Black Qi was what Cen Lizhui desired.
