Chen Fan's interest wasn't piqued until he saw Theseus.
Of all the five foreign fighters, only Theseus was worth his time. Chen Fan regarded the dark Shadow Force that surrounded Theseus and realized that he was the most powerful Extraordinary One he had ever met by far. The way Theseus walked out of the shadow resembled the Art of Concealment practiced by Immortal Cultivators. Despite its visual similarities, the Art of Concealment was a high-level Dharmic power that can only be used by Connate level Cultivators, while Theseus had only played a few visual tricks to create the illusion that he had emerged from nothing.
Theseus the Phantom, Zoro the Thunder King, Park Kyung-hwan of the True Teaching Sect, Olga the Crimson Lady and Buck the Diamond.