The Soul's Reflection - Book IV: Last Seal: 4

Everything begins in a cellar. Everything ends in the Abyss. And between the two, a choice. Alexis has become the Border-Guardian. He has faced Valerius, transformed the six Locks, and offered the world what no one had dared to offer in a hundred thousand years: the freedom to choose. But beneath the foundations of reality, a threat older than the First Exorcist is awakening. The Abyss, a void that drains the light from souls, threatens to swallow the world. Valerius, thought defeated, has been brought back by this dark force. He is no longer a man. He is the Hunger, the desire for nothingness, and he awaits Alexis at the edge of a fissure that opens onto the absence of everything. To defeat him, Alexis must plunge into the darkness, discover the true nature of the machine that seals the Locks, and forge a pact with the most unexpected of allies: the Devourer Lord. But the true battle is not the one we believe. It is not won with a blade. It is won by accepting that the Border-Guardian is not a single being. He is a choice. A choice that every soul must make. A choice that will be passed down from generation to generation, from Lyra to Tian, from Tian to Aelle, until it reaches you, reader. Plunge into the final volume of a dark and luminous saga, where the boundary between Good and Evil is a mirror every soul must learn to look into. And remember: the boy who spoke to shadows is watching you. He is smiling. And all that remains for you is to choose.