After the player completes each shrine in the dark world (Power, Wisdom, Courage) they will be able to pull the Lv4 sword from the pedestal in the dark world. The sequence should be updated to reward the Lv4 sword and additionally should trigger an event which opens up the way to the Fortress of Secrets. This will be in contrast to the Zelda's kidnapping sequence which takes place after the Master Sword is pulled in vanilla.
After the player completes each shrine in the dark world (Power, Wisdom, Courage) they will be able to pull the Lv4 sword from the pedestal in the dark world. The sequence should be updated to reward the Lv4 sword and additionally should trigger an event which opens up the way to the Fortress of Secrets. This will be in contrast to the Zelda's kidnapping sequence which takes place after the Master Sword is pulled in vanilla.