What evolves because of our ruins? Codex Extremophilica is the second part of the “Dark Life” speculative design project conceptualized in the Fall of 2023. This codex serves as both an artbook and theoretical text that speculates the potential mutations and evolutions of extremophiles who thrives because of anthropogenic alterations of the planet. Utilizing Midjourney AI, this project morphs the extremophile with post-Anthropocene landscapes and asks how might dark life flourish in waste and ruin?