Insert the Forcefield stone in the Closed space tree of the Sleeping Land Eliminate Red Scale Wyvernand Black Scale Wyvern then talk to Kalton Brown in Camp Argent. Use your quest tracker to see your progress.
Carlton Brown: The forcefield is complete. We just have to set it up. NakanoAzusa: Wyverns will stay away once it's set up, right? Carlton Brown: Yes, at least for now. NakanoAzusa: Good. I will take care of setting it up. Wait here. Carlton Brown: Uh, I forgot to tell you something. NakanoAzusa: What is it? Carlton Brown: Since it's an enclosed space, Wyverns wont want to be Carlton Brown: caught inside. NakanoAzusa: Don't worry. I can handle them. Carlton Brown: All right, good luck then... Take care!
Reminder Dialog
Carlton Brown: I was attacked while trying to install the forcefield. Carlton Brown: Of course! Please, be careful with those parts.