Eioneus is a planet in the Metalion Solar System. It is a planet with grasses, trees, rocks and volcanoes.


Most of the time the Bacterians attacked Eioneus and transformed it into a base, only to be liberated by Vic Viper later. In Gradius Gaiden, Eioneus was damaged by a black hole. However, in Gradius Galaxies, Eioneus was not worse for weary and a civilization seems to have formed.

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