C1562 Tianyuxing

Cheng Fei had asked the Hui Tian Tower before, and the Hui Tian Tower said that the Emperor of the underworld gave him the other half of the cultivation technique.

Furthermore, he gave Cheng Fei a general direction to deduce his cultivation technique's origin, allowing him to continue deducing it.

The Torch Dragon's Eye could be said to be a technique