A Maenad.
Maenads are the names of those who go insane and kill others or/and themselves due to the influence of the RakeThe King of All Beasts. Some of them have been mutilated to the point where they are inhuman monsters.
Maenads are utterly decentralized, with no commanders nor ranks among them. It is simply known that they do what they believe is the right thing to do, what the will of their Lord . This leads to random murders, mass killings, cults, and other horrors.