Everyone wears a mask. Weather it’s to hide themselves from the world or hide the world from themselves.
In this world mask are power. Everyone is born with the ability to use their mask which can have them unimaginable power, only at the cost of life-threatening trials. Parasites had taken over the world long before the arrival of the mask. These parasites came from a different world, the abyss. The abyss was a massive dimension that held a variety of different geographical features and climates.
Raven never thought of himself hiding behind a mask. After a short brush with death, he realizes he has to embrace the mask and keep on killing.