How to break the fetters of sword spirit nightmare?

What you want to ask is how to open the sword spirit nightmare hall. The method is as follows:

1. Complete the main task of Skybreaking Island. In chapter 5, after sealing the magical Long Mai, I went to Tianyu Altar on Skyshattering Island to discuss with NPC Guangyunling about receiving the task.

2. Go to the intersection of Nightmare Hall in the northwest of Tianpo Island, and you can open the Sword Spirit Nightmare Hall.