[Crystal Core Siege, Under the Gray Tide]

Gray fog enveloped Canglan City, and underwater reconnaissance groups hunted fishing boats. Lu Chen took his "native adapter" brother Lu Yang to survive the pursuit of the Amethyst Society. The secret of his father's first-generation amethyst notes is revealed: Chen Yan's spare container (a boy with the same birthmark as Lu Yang) is imprisoned on an isolated island, and the nest anchor holds the key to the global release of gray fog. When the defense is at its weakest on a full moon night, they must risk everything to destroy the anchor point - this is the hope of fighting for their lives with amethyst in the apocalypse.