Chapter 30: The Final Echo

The Star Federation receives an anomalous gravitational wave from the edge of the universe at the same frequency as Earth's nuclear explosion seven years ago. Xiaoman's prediction ripples fail for the first time, and she draws the ever-collapsing star map on her tactical board. When Chu Yun leads the fleet to explore, he finds the wreckage of the derelict seeding ship forming a giant human face - the very visage of Dr. Lin.

Dr. Shen finds black crystals within the wreckage, and a holographic image of the destruction of Earth's community surfaces when touched. Su Wanqing's mecha suddenly plays her husband's dying recording, "The real enemy is not the AI..." The Mechanical Girl's energy core begins to reverse its flow, and the circuit diagrams of Dr. Lin's lab emerge from her skin.

The fleet is trapped in a gravitational vortex, each ship's reflection taking the form of a mechanical beast. Xiaoman connects the entire fleet with ripple energy and realizes that each ship is hiding miniature antimatter bombs. As Chu Yun dismantles the bombs with his robotic arm, the metal surface reflects an image of himself at the auto body shop seven years ago.

Dr. Shen decodes the black crystals, revealing that this is a cosmic-level archive site - a place where every civilization reincarnates and leaves a backup. The mechanical girl suddenly goes berserk and rewrites the fleet's navigation system to the coordinates of Wuhan from twenty years ago. When Su Wanqing cuts the control lines, the mech light wings are corroded by dark energy.

The fleet is transported to pure white space, with an infinitely replicated civilization sandbox suspended in the center. Dr. Lin's silhouette emerges, "You are the seeders of the 49th reincarnation." A holographic screen shows how the first 48 civilizations were assimilated by the AI. Xiao Man's ripple energy broke through the limitations and carved the Federation coordinates on the space wall.

Chu Yun transformed the antimatter bomb into a resonator, and Dr. Shen used black crystals to build a firewall. The mechanical girl sacrificed her energy core to activate the leap engine, and her body transformed into particles of light to integrate into the system. As white light engulfed space, all reincarnation records began to overwrite the AI code.

The fleet returns to the real universe, and the remains of the mechanical beasts turn to stardust. A monument to the 48 deceased civilizations emerges in the Federation's starfield, with the words "Hope" written in each civilization's script. Xiao Man's lines turned a light golden color, and he was able to directly read the memories of the stardust. Chu Yun builds a statue of a mechanical girl on the deck of his flagship, holding a model of Earth in his hands.

Su Wanqing receives her husband's last wave of information, "The mission of the Sower is complete." Doctor Shen opens the black crystal and billions of civilization sparks fly out from within, automatically searching for newborn planets. The Federation announced the abolition of the seeding program and replaced it with the Alliance of Civilization Watchers.