Fury

Furies are mythical dog-faced women that act as judge, jury, and executioner to anyone they consider evil. They can go after a shoplifter and assume as a murderer and they take great pleasure in the kill. When they focus their thoughts on someone, they force him to hear the cries of all his former victims. The smoke of a Fury will kill bad people, but in good people, it will open a portal of unexpressed fury, it builds until it consumes their humanity and turn them into a fury. Furies normally move around by smoke-type of demonic teleportation.