In the Prequel to Chivalrous Warrior, the falling probability of the Dragon Vortex Ring is 1/889. Players need to enter the giant treasure box monster in difficult mode to get it. At the same time, they need to go to the corresponding map to find the dragon's nest monster and kill it, and have the opportunity to get the ring of the dragon vortex.
The above contents are for reference only, and the specific drop probability may change with the update of the game version. For more accurate information, it is recommended to consult official website or an experienced player.