Hollowfication (虚(ホロウ)化, Horōka) is the term used to describe the process by which the strength limit of a soul is increased by removing the boundary between Shinigami and Hollow. This allows one to gain tremendous power if their Hollowfication can be controlled, which is personified by an "inner Hollow" reflection of the person in their inner world. A Hollow-like mask appears when entering this state. The term is synonymous with the act of donning a Hollow mask.