The individual known as Eidolon, a Zabrak assassin of male gender, was the proprietor of the Eidolon Security firm located on Nar Shaddaa during the period known as the Cold War. In the year 3643 BBY, he became a selected participant in the Great Hunt.
Eidolon was lured from his secure location after the eventual Grand Champion of the competition orchestrated the bombing of his corporation's manufacturing plant and disseminated its confidential data onto the HoloNet. This was accomplished with the aid of Hutt lieutenant Gele'ren and his slicer, Anuli. Following the slicer's upload of the records, his assassin droids terminated Anuli, and he communicated to the hunter that he would agree to a meeting, provided they could successfully navigate the path to his location on the lunar surface.
Having overcome Eidolon's defensive forces and successfully reaching his location, the hunter and Mako engaged him in a confrontation, resulting in an attack following a brief exchange. The hunter prevailed over Eidolon in battle, subsequently delivering him to the Hutt Cartel to collect the bounty for his capture.