There's an old saying that with enough money, even ghosts will grind your grain. With the financial backing of the World's Number One Gambling House and the muscle of the Xuanjian Sect, they managed to recruit many martial artists who were being hunted by enemies, as well as some schools of Martial Arts driven to desperation.
These schools were already dissatisfied with the world of Martial Arts. Like the Xuanjian Sect, they were relentlessly pressured by the martial community, always on the verge of destruction. Since the Xuanjian Sect was proposing an alliance, they had no reason to refuse. Coupled with the money from the World's Number One Gambling House, cooperation met with no objections.
Now there were five schools gathered under the Xuanjian Sect with more than three hundred members, and their strength continued to grow. For the time being, they were called the Xuanwu Alliance.