|Real name:||Roman Sionis|
|First Appearance:||Batman: Crimson Mist|
|Created by:|| Doug Moench|
|Affiliations:||False Face Society|
Black Mask's full history is unknown.
When Batman was restored by Alfred and began slaughtering the criminals of Gotham for their blood, Black Mask met with Two-Face's gang to discuss what to do about it. However, Black Mask rejected the offer of an alliance, foolishly believing himself to be untouchable.
Sionis quickly regretted this decision when Batman attacked his hideout and butchered him and his entire gang, proceeding to leave their severed heads on the fences of Blackgate Penitentiary as a warning to the inmates within.