snake charmer

Exploration Stage: Greenhouse
From: Huntress
Description: We know that this unidentified culprit gave the snake-eye to the ouroboros. But why did the snake attack the man and not the owner, whom it had known since birth? Was he somehow being manipulated by the killer? But how on earth?
Completed: I see! This is a hawk whistle. It's a snake charmer's tool. With it, you can control snakes. It works the same way as the ultrasonic whistle used to train dogs.