The Imperial Treasure Column requires players to complete the level 171 main quest to open it. The analysis is as follows:
1. The Royal Treasure Column will only be opened after the player has completed the level 171 main quest and cleared the dungeon twice.
2. After the Royal Treasure slot is opened, players need to defeat Dian Wei through the main dungeon to obtain the Royal Treasure blueprints. Once they have the blueprints, they can build the lowest level Imperial Treasure Bronze Sword.
