Fetus

Red Demons are a lot like kiabutsu. They will try to chase you, But instead of traping you in an enclosed area, your effect is disabled. As rust, they do a little bit of damage until your dead.

Trivia

 * In vO.15, they can meterialize out of pools of blood at Rust's corpted school and replace the Kaibutsu. For some reason though, they are larger and harmless

Theories

 * They could repreent Sabitsuki's disease, scince they are found in the flesh walls world.
 * They appear a lot in the final rust chapter. As the hospital corridors begin to rust, There are more and more of them.
 * They are found in two areas in the flesh walls world with the mouth background. One will apear in the area with clan mouth, and a lot more will appear in an area with a dirty mouth. They may be a link to coughing up blood.