If you are looking for the "paper" found at the end of the level, it is the First Testament . It is located in the final room of 0-1: Into the Fire ULTRAKILL Wiki
The environmental storytelling is subtle but potent. Scattered throughout 0-1 are the corpses of other "visitors" — humans in tattered uniforms, impaled on spikes. One audio log (found in a hidden alcove) whispers: "The machines don't want our souls. They want our blood. The blood is the fuel." This tells the player that V1, the protagonist, is not a hero. It is a vampire in metal. 0-1 does not ask you to save anyone. It asks you to consume.
The climax of 0-1 isn't a final arena, but your first encounter with , a "Scrapper" robot. In this level, you don't actually kill it; you fight it until it retreats further into the facility. This encounter is crucial because it introduces Parrying . By punching Swordsmachine’s yellow-flash attacks with your Feedbacker arm, you can regain full health and deal massive damage, a skill required for high-level play. S-Ranking and the P-Rank
The level’s title, "Into the Fire," is literal. You are entering combat immediately, but metaphorically, it represents the player’s descent from a human into a machine of war. V1 (the player character) is not a hero. It is a robot that drinks blood to survive. 0-1 teaches you that slaughter is not a side effect of your journey; it is the fuel.
To "Perfect" (P-Rank) 0-1, you must maintain a high style score, kill every enemy, and finish with a blistering fast time. This encourages "Rocket Jumping" (using your own explosives) and "Slide Hopping" to navigate the metallic halls with predatory speed. Conclusion