Adephagos

The Adephagos (星喰み), also dubbed the "Cataclysm" is an antagonistic non-sentient monster that appears during the third segment of Tales of Vesperia. Acting as the omnipresent threat for the second half of the game, it is directly related to the abuse of aer through excessive blastia usage.

History
According to the carvings on Mt. Temza, overuse of harmful blastia and the artes used by Children of the Full Moon during the time of the Geraios Civilization caused overproduction of aer from the Aer Krene: a large body of this excess aer became corrupted somehow and coalesced into a non-sentient being that converted any living thing near it into aer and devoured it. The Krityans, humans and the Entelexeia allied to stop the Adaphagos: constructing a powerful installation called Zaude, they fed the sacrificed lives and power of Children of the Full Moon into it and created a barrier around the planet, sealing out the Adaphagos. The effort and losses from the battle against the Adaphagos triggered the downfall of the Geraios Civilization: the few remaining Children of the Full Moon together with the Entelexeia formed the building blocks for the Empire of modern times.

During the game, Alexei accidentally causes the Adaphagos to be released. Although the damage to Zaude is patched, it eventually fails completely and monsters spawned by the Adaphagos begin attacking the cities. Brave Vesperia, the guild led by Yuri Lowell, soon find that converting apatheia into spirits will allow them to attack the Adaphagos directly, as the energy of spirits appears to harm it. After preventing Duke Pantarei from enacting his own destructive plan to stop it, the group attempt to destroy the Adaphagos. They are initially helpless as even the converted blastia from across the world proves insufficient, but Duke is moved by their resolve and lends the power of Dein Nomos to destroy the Adaphagos. After it is destroyed, the Entelexeia it had absorbed during its initial attack are also converted into spirits to heal the land.