Lyssa was a figure in Athenian tragedy. In Aeschylus, she appears as an agent of Dionysos sent to drive the Maenads mad, and Euripides describes her with snakes on her head and glittering eyes. In his work Heracles tells how the vengeful Hera ordered Lyssa, through her messenger Iris, to make the hero mad, to whom she was a great enemy. Daemon tried to dissuade Iris without any success, and against her will, she introduced herself to Heracles, urging him to kill his wife and his own children.
By her attributes, she was related to a group of Daemones: Mania, madness, Coalemos, stupidity, and Anoia, dementia. Its Roman equivalent was called Wrath or Furor. Sometimes, they also appeared in groups, like the Irae and the Furores. (will and fury as mentioned above).