After conversing with Jian Si for a while, Arthur came to know of the whereabouts of the princess. As he expected, she was abducted by Vyncent's sect, the Golden Earth Sect. They were once a powerful sect but after a fallout with several other sect, they were half-destroyed, dropping to a second-grade power.
They still had powerful individuals but it shouldn't be hard for Arthur to retrieve the girl, who's still alive, fortunately.
The reason several sects ganged up against the Golden Earth Sect is due to its sinister techniques. They require young females, virgins especially, which are sacrificed in some kind of a ritual to strengthen the disciples there. They require an astronomical amount of females so they began hoarding mortal cities and towns, abducting every female. This angered the local powers which forced it to submission.