Throne and Liberty Return of a Masterpiece
Chapter 6: The Song of the Vienta Dwarves Exploration Codex Entry

Upon reading the lyrics, Henderson said he'd heard that Sienna, a comrade of his, had broken the heart-shaped stone into pieces and hidden them away. Apparently, the pieces can be collected and put back together using a device in the Chapel. He told you to remember the following lyrics: "Let's fuse the heart pieces! Three, two, one! The Golem will rise when the heart is done!"