A great wizard of the Northern Song Dynasty, surnamed Qian and named Yixi Bai, once wrote a travel journal named "New Southern Book," recording the customs of the wizard community during the Tang and Song dynasties.
In the "Xin" chapter of this journal, an old news item from the Kaiyuan years is mentioned, referring to '...the nature of dragons is crude and fierce, yet it fears scorpions, loves jade and Kong Qing, and craves roasted swallow meat. Therefore, those who eat roasted swallow meat must not cross the sea...', indirectly pointing out that dragons like to eat roasted swallow meat. Even those who have eaten roasted swallow meat, as they are stained with the scent of roasted swallow, are easily harmed by salivating dragon beasts, hence it is not advisable to cross the sea after eating roasted swallow.
