Primal

Primals, also known as "eikons" are magical beings in Final Fantasy XIV who have been summoned ten years ago by the beast races of Eorzea. They all are classic Final Fantasy summons, and may be related to both the Echo and the sudden new attacks from the Garlean Empire, who considers them a powerful threat. Each beast race has its own Primal and plans to use them to its own ends, either to harass the city-states, self protection or to fight against the Garleans.

The summoning rituals requires a massive amount of crystals and shards of the same type used by crafters, a fact that prompted some of the beast races to stop selling those shards to the city-states.

Due to the presence of Primals in eorzea and the massive amount of energy needed to summon them, it is said that the flux of aether over Silvertear Falls has been disrupted and the whole land of eorzea will slowly perish if this process isn't reversed.

Known Primals are: Also, in the promotional trailers, a creature that resembles Diabolos has been spotted, and in the opening CG, a giant dragon is leading an army of dragons against Garlean airships.
 * Ifrit, Primal of the Amalj'aa.
 * Garuda, Primal of the Ixali.
 * Titan, Primal of the Kobolds.
 * Leviathan, possibly the Primal of the Sahagin, as he is attacking Limsa Lominsa's ships
 * Odin
 * Moogle