The Slayers, Halaku, or the Seventh House are the tormented former angels who served as bringers of death in order to make room for more life in Demon: The Fallen. The angels of the Seventh House were placed in a dilemma when humans were created, as they reacted to their new task with fear and sadness. Many joined the Rebellion for one simple reason: to be loved by those that feared them. The Slayers served as reluctant warriors, and instead focused on gathering the souls of the deceased until they were locked in the Abyss. Upon breaking free, the Slayers found death had continued unchecked in their absence, with countless souls passing on to realms unknown while the living suffered with the loss. Many now reason their only way to show their love for humanity is to guide the process of death once again so that it inflicts less harm.
During the Fall, the rebels of the Seventh House were the first to present themselves before Adam and Eve. Madisel came forth to explain that the fruit that Adam and Eve had just eaten had died so that they may be sustained, and that they caused that death out of love for them.
As they were the first to step forward, they were also the first cursed by Michael. They become the Halaku, the Slayers; whereas humans were not touched by death before, now even humanity would fall under the sway of the Seventh House.