"I don't know, it seems to have been here for a long time."
In today's world where goblins are rampant, I don't know how long it has existed. I only remember that it sent away many people. The seal sent away Taoist priests one after another. The master still refused to say which number I was in. I only remember the complicated look in his eyes on the day I left.
Purpose: Catch monsters and be safe