The cage of the dragon is indeed the unique secret trick of the Dragon god, and it is impossible to learn this trick without the blood of the Dragon god.

Ye Dun knows this trick because he learned it from the Dragon God symbol.

Ye Dun refers to all the letters in his hands and practices them.

He bears the blood of dragon and phoenix, and is very interested in the tactics left by dragon god. He has studied for a long time. This cage of dragon was what he learned at that time.

It's just a pity that the dragon and Phoenix blood veins on Ye Dun are too...