Hecatoncheir (summon)

Unreleased Hecatonchires is Oerba Dia Vanille's Eidolon in Final Fantasy XIII. It is an Earth-elemental creature with multiple arms.

During its Gestalt Mode it transforms into a machine of sorts that Vanille rides. Her super move is called Gaea Salvo.

Etymology
Hecatonchires is a race of giants from Greek mythology. They are depicted with hundred arms (and sometimes even fifty heads). They are children of Gaia and Uranus.