1. Find the Bird's Nest: The Bird's Nest is located outside the courtyard of the northern undead, on the edge of the cliff.

2. Select the items to be redeemed: stand in the Bird's Nest, open the props menu, and select the items to be redeemed.

3. Discard items: press the decision button to open the menu, select "Discard" from the menu, select the quantity to be discarded, and then select OK. If you leave the menu, the discarded items will appear in the Bird's Nest.

4. Look at the map again: let the map look again, for example, leave the undead courtyard in the north and come back, or you can choose to leave the game and look again.

5. Find the exchange items: You can get the exchange items by going back to the Bird's Nest for investigation.