After collecting Everythinggj upstairs, jump down and head back toward the Illusion Realm. There's a save point at the entrance, so save your progress.
Save and enter the Illusion Realm. The quest "Dream Envoy's Illusion" will update; only one remains.
Let's find any available exit door and leave. Use a teleport point to travel to the "Phantom Ghost Tavern".
Approach and talk to the Phantom Ghost to trigger a cutscene where they repair the Pipa for you. After the repair, you'll receive the Shadow Armament "Illusion Pipa".
You can now use the Pipa to explore areas that were previously inaccessible.
