- Complete Monster: Incarceron itself, by far.
- Nightmare Fuel: All over the place.
- Incarceron is running out of organic resources, so sometimes people and animals are 'born' with mechanical parts.
- Finn's memories of his first few years there.
- Though rare, some people are literally born via Incarceron.
- Finn encountering the Beast in the Cave.
- If Incarceron were to Escape, the entire prison would suffocate, freeze, and die in darkness.
- Paranoia Fuel: Incarceron's Eyes are everywhere.