Step 3: In the Great Sphinx of Giza, interact with the large console after finding all 12 Stone Circles. The 50 Silica can then be traded for the Isu Armor inside the Sphinx. Step 2: Collect 50 Silica (yellow glowing stones) from tombs. Step 1: Get the 12 Stone Circle collectibles to open a secret room in the Great Sphinx Of Giza. Successfully complete the following tasks to unlock the Isu Armor costume: You can get the Isu Armor at any point in the game after completing the main quests in Siwa (starting region). They decided to leave it in the game after it was discovered since it is harmless. It was a dev tool that was left in the game by accident. Additionally, this was not originally intended to be in the final version of the game. Note: The changes will reset after dying or reloading the game. Then, press L2 + Triangle to change the hair style and press R2 + Triangle to change the beard style. Navigate to the 'Gear' tab/menu at the character screen in the pause menu.