Legend of the Paladin
Seems like each one will be someone's different path to immortality. I'd guess Cheng Lin will make up one of the others, or he might even copy the Fat Ball's.
Considering how the virtue network was made by the 6th wielder, it's entirely possible this dragon place was either made by the first or third wielder and the sixth was inspired by it when creating his virtue network. It kinda feels like the dragon network is an attempt to replace the Heavenly Dao as a whole.