Eidolon n. : An image or representation; a form; a phantom; an apparition.

Example:
how to change Eidolon name in final fantasy iv ds?

Taxonomy
Eidolon, Eidolon Software, free encyclopedia, computer game, Lucasfilm Games, search, free dictionary, music, games, the 1980s, fantasy, floating city, in the Shadow, role-playing game, campaign setting, the Serpent, Serpent Riders, the Heretic.

Defination from the web:
Eidolon (Serpent Rider), one of the Serpent Riders in the Heretic-Hexen computer games ... Eidolon (Final Fantasy), the name given to summonable creatures in Final Fantasy IV, Final Fantasy IX, and Final Fantasy XIII, known in other ...