To find the Tavern of Nil in Octopath Traveler 0, you will need to explore some of the game’s areas. Before you can reach this secret area, you will need to find a special journal, uncover a hidden island, and complete a few quests that are part of Stia’s storyline. In this guide, we will show you how to unlock the Tavern of Nil and find the Strange Key Location.
How to unlock the Tavern of Nil and the Strange Key Location
To reach Agapea, you must first find A Priestess’s Journal in the Skies of Vanity. Reading it unlocks “The Hidden Isle” side story, which leads you to the hidden island of Agapea. Completing the quests there continues Stia’s storyline and eventually unlocks the Strange House and Tavern of Nil. After finishing the game and the post-game boss, you can enter the Tavern of Nil to collect the final Music Scores.
The Hidden Isle

During Bestower of All – Chapter 8, head to the northwest corner of the Skies of Vanity. You will find a journal there that begins the side story “The Hidden Isle.” You will find the journal at the edge of the path, and you need to complete a few earlier quests to reach the area. The journal will tell you that you need to visit a place to find the rings.
Enter Island Agapea

Now you need to follow the quest and talk to the shrine maidens on the Isle of Orsa to reveal the hidden island Agapea. To find the shrine maiden, enter the Isle of Orsa and move forward to reach the underground altar. Here, you will find four shrine maidens.
The shrine maidens will tell you that they don’t have much time left and will ask you to reach the island of Agapea to free the souls of all the people. To reach Agapea, use your boat and travel through the ocean to reach the coastland region of Agapea.
The Strange Key Location

In Agapea, near the fountain, you will find a cat. Use the Entreat action on Meowstesis of the Pawbeans. You need the Animal Whisperer skill to get the Strange Key, which is required to build the Strange House.

Next, return to Wishvale and build the Strange House. Along with the Strange Key, you will also need 30 Quality Lumber and 20 Quality Metal.
How to Unlock the Tavern of Nil

Now you need to defeat the boss Amatsukmi No Orochi to obtain the Heavenly Jewel. Once you enter the Strange House, Isla will open a portal to the Tavern of Nil by placing the heavenly jewel on the decorative piece of the strange house.
Once Isla puts the heavenly jewel in the decorative piece, it will glow with a strange light and open a portal. Interact with the heavenly jewel to enter the Tavern of Nil. Just keep in mind, if you haven’t unlocked Isla yet, you must first collect all Letter Fragments.
Rewards
Inside the Tavern of Nil, you can pick up the final four Music Scores in the game. You will also find the Spurning Ribbon, an accessory that completely blocks all random enemy encounters. The music score can be found by examining the tavern on the right side of the sitting area.
You will find the spurning ribbon on the stange of the tavern. On the stage, you will find Delan Poe. Talk with him to find another music score. Next to Delan Poe, you will find Rugis Surra. Talk with him to find the Arena music score. On the stage, you will also find Myano Wincy. Talk with him to get the creational music score.
