After obtaining this accessory, go back to where we collected the materials earlier. Head further in, and at the end, you can climb over. Once you flip over, you'll reach the cellar.
After flipping over, head right. There's a resource chest in the right corner, and a save point on the left.
After saving, look ahead; there's another resource chest further on.
Save and head left to trigger a cutscene. When the thief talks to us, just pick any dialogue option. After the conversation, they give us a survival accessory called the "Arrow-Dodging Amulet".
