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Shape Corrosion
Primary Ability

Gastrea Virus

Shape Corrosion is the process of a human turning into a Gastrea.


When a living being is infected with the Gastrea Virus, and the erosion rate exceeds fifty percent, the host's body begins to turn into a Gastrea, no longer being able to keep their human shape and self-control.[1] When undergoing said phenomenon, the human, when in possession of an object, has the possibility of having noted artifact engraved inside their body.[2]


  1. Black Bullet Manga: Chapter 3, Page 20
  2. Black Bullet Manga: Chapter 8, Page 38