Where can I brush a purple sea needle?

1. First of all, players need to come to the underwater totem trial after entering the game, as shown in the following figure:

2. Then we need to find the Millennium behemoth at the bottom of the sea to search, as shown in the following figure:

3. Click the pick-up function indicated by the red arrow after the search is successful, as shown in the figure below:

4. Search for the Millennium beast, and you will have the opportunity to get your own anchor needle, as shown below:

5. Finally, if the picking is successful, you will be prompted to get the anchor needle, as shown in the following figure: