To unlock the Fountainhead Palace in Sekiro: Shadows Die Twice, you must defeat the Divine Dragon in the Divine Realm. After defeating the boss, you will unlock access to the Fountainhead Palace and be able to progress in the game.
Exploring the Sunken Valley
To unlock the Fountainhead Palace in Sekiro, you first need to start by exploring the Sunken Valley. This area is accessible after you defeat the Guardian Ape and obtain the Shelter Stone. To reach the Sunken Valley, you need to progress through the game until you reach the Bodhisattva Valley Sculptor's Idol. After that, you will find the Sunken Valley Cavern Sculptor's Idol nearby, which will allow you to delve deeper into this new region.
Defeating the Long-Arm Centipede Giraffe
Once you are in the Sunken Valley, you will encounter the Long-Arm Centipede Giraffe mini-boss. Defeating this enemy is crucial to gaining access to the Fountainhead Palace. The Long-Arm Centipede Giraffe drops the "Fresh Serpent Viscera" item, which you will need to progress further in the game. This item is essential for unlocking the path to the Fountainhead Palace.
Obtaining the Mortal Blade
After defeating the Long-Arm Centipede Giraffe, you will need to acquire the Mortal Blade. This powerful sword is necessary to access the Fountainhead Palace. To get the Mortal Blade, you have to progress through the game until you reach the Senpou Temple, Mt. Kongo area. Here, you will face the Folding Screen Monkeys boss battle. Upon defeating the Folding Screen Monkeys, you will obtain the "Mortal Blade" item.
Visiting the Divine Realm
Once you have the Mortal Blade and the Fresh Serpent Viscera, you are ready to unlock the path to the Fountainhead Palace. Head back to the Wedding Cave Door near the Bodhisattva Valley Sculptor's Idol, and use the Fresh Serpent Viscera item on the door to unlock it. Beyond the door is a realm that is key to accessing the Fountainhead Palace. This realm will lead you to the Divine Realm and ultimately to the entrance of the Fountainhead Palace.
Accessing the Fountainhead Palace
After progressing through the Divine Realm, you will eventually reach the entrance to the Fountainhead Palace. This area is characterized by its stunning beauty and challenging enemies. To fully explore the Fountainhead Palace, be prepared for tough battles and intricate level design. By following these steps and overcoming the obstacles in your path, you will successfully unlock the Fountainhead Palace in Sekiro: Shadows Die Twice, and continue your journey through this captivating world.