Age of Rust: Train Ark

Era of Rust: In the 27th year after the cataclysm broke out (the scarlet rift appeared), the world was eroded by rust energy. The surface was barren, resources were scarce, and puppets (human beings/creatures infected by rust) were running rampant. The remaining humans relied on "train arks", "underground strongholds" and "orbital city-states" to survive, forming three major forces: where the protagonist is The "North Wind Train" (neutral, with the goal of ending the rust and closing the rift), the "Scarlet Church" (an extremist force, trying to control the rift and rule the world), the "Free Orbit Alliance" (a loose alliance, focusing on plundering resources and self-protection), and the hidden forces "remnants of the Scholars Association" and "old world legacy AI". Core setting supplement: The scarlet rift is not a single entrance, but 7 "main rifts" + countless "sub-rifts" distributed around the world. The rust energy comes from the "rust dimension" on the other side of the rift; the Scholars Association was not completely destroyed that year, and some researchers were hidden in various places, mastering the key technology to close the rift; Puppet The puppets are divided into levels (Iron Level → Bronze Level → Steel Level → Silver Level → Gold Level → Crack Level). The higher the level, the more completely corroded by the rust energy and the stronger the ability. The Crack Level Puppet can control the rust energy; the Train Ark can be upgraded by absorbing the core energy of the old world and fusing the crack fragments to become the core carrier against corrosion.