How can I get the key to the snake witch cave that flies to Parry Cave?

There is an NPC named Doctor under a tree in Long Feifei, who can receive the task of Parry Cave ~ It is quite experienced ~ At the last step, you need to kill five basilisks ~ The basilisk is in the deepest part of the cave ~ The path leading there is guarded by BB, the wizard of Elvis Presley in Long Feifei ~ Be careful ~ You can get the key to the basilisk cave by killing 30 basilisks after entering. I believe many people don't know what it's used for ~ what it's used for ~ There's a door behind the statue that killed the snake demon ~ There's a handle-like device on the side of the earth slope ~ Click it ~ The door will open ~ Your key will be meters ~ When you go in, it will be a room as big as the outside ~ There are many queen snakes ~BB~ It's estimated that the rice people found this room ~ So the BB here brushed a bunch of ~BB 35. There is also a handle on the slope next to the door ~ Click the door and it will open again ~ Once the door is closed, you will have a chance to enter again ~ You will be prompted with a key ~ So whoever wants to hit this BB will have a chance ~ Similarly, you can run in when someone opens the door ~ I don't know what this BB is ~ I hope it is a good thing ~