The Fake Heart of Atomagia

"Atoraxxion's heart, barely preserved. The Heart of Atomagia must be destroyed. Before the Ator Legion falls into someone else's hands. I have decided to uphold this as the will of the Dark Goddess. Thus, I chose to deny everything of my Master. To do so, I decided to replace the heart hidden by Syca with a fake one." The records left in Orze's Eye seem to suggest that the heart Illezra took was a fake. So, where's the real one...?