Seen in “Winter Night Phantom”.
It is named after the creatures of Greek mythology, the Eumenides. It is a large scale model of the toy robot bombs used throughout the episode to assassinate city officials. Eumenides is the first megadeus of foreign origin to attack Paradigm City. It was controlled by "Phantom" (Sybil Rowan), the woman who carries out the bombings. Built as a suicide model, Eumenides was rigged with explosives, forcing Big O to fling it out of the city before detonating it with the Arc Line.
Eumenides can shoot long range destructive beams from its eyes.
The main purpose of Eumenides is to be a self-destructive device, so the bombs hidden within it are its most powerful weapon. The bombs were controlled by remote radio control.