"Tang Nian Supplement" records that one day in the last year of Xiantong in the Tang Dynasty, a green dragon fell into Tongcheng County. It suffered many burns on its body and turned into a wisp of smoke after a while.
Legend has it that a dragon takes a thousand years to become a dragon, a dragon takes five hundred years to become a dragon, a dragon takes five hundred years to become a horned dragon (with horns on its head), and a thousand years to become a dragon (has wings). And to transform a dragon into a dragon, it needs to refine seven dragon scales before it can be reborn...
This article tells this story.
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