Leon, a general of the Dawn Alliance, was gravely wounded by a Black Sun Priest and fell into the sea three years ago. Princess Cassandra of White Rock Island saved him, and he hid his identity as her guard while recovering. Three years later, High Priest Dorian, the true Black Sun Priest of the Abyss Cult, falsely accuses Cassandra of "blood pollution" and forces her to undergo a purification trial, aiming to use her royal blood to open the Abyss Gate and summon the Titans. Forced to act, Leon reveals Dorian's lies and fights through temple guards, war beasts, and assassins to protect Cassandra. Together they uncover the truth: royal blood is not a sacrifice but the key to sealing the Abyss. Leon collects three fragments of the dark spear, defeats Dorian in his monstrous form, and seals the rift with Cassandra's blood. Peace returns—but a deep whisper from beneath the seal warns: more Titans await.