In 2076, after the earth experienced the "Great Collapse", the surface was ravaged by foreign creatures, and humans huddled in a few uneroded "dome cities". In the name of "ruling civilization", the multinational organization AE secretly carries out the "Ark Project" in border areas - by integrating foreign biological genes and mechanical technology to create "perfect life forms" that obey human orders. However, the experiment went out of control, giving birth to the terrifying species "Erosion" with both biophagic and mechanical evolutionary capabilities. They feed on energy and no grass grows wherever they go.
