C1724 Ripple

The reason Cheng Feng disappeared was because he had used the Shadow Kill.

The Shadow Kill was the first kill of the Seven Killing Techniques, so Cheng Feng had already trained in Mastery Stage.

Once it was unleashed, he transformed into the shadow of a myriad of things. Even a peerless expert would not be able to detect him.

Previously, if it wasn't for Zhu Wen's Martial Spirit of Mirror