The way to get the vigorous knight prequel Medusa suit is as follows:

First, the player needs to go to the wet hole copy 1. In this copy, complete the previous tasks. The pre-task requires the player to defeat Glacier-class boss No.1 in the mode of guarding the temple, and then meet a blue-robed mage while making a fire to avoid BOSS. After the player talks with the blue robe mage, he needs to get the artifact snake hair banshee's tears within a period of time and give it to the blue robe mage to complete the dialogue. In this way, you can unlock the hidden character Medusa and get her exclusive costume-the green scale phantom suit.