Megaleio (Eternity)

Megaleio (μεγαλείο, pronounced "Meh-Galleo") was a massive Dragon that grew up from a mere hatchling cared for by Zagreus himself and embodied the divine power of his brood which became the first Pyrakto, he represented the rest of his brood, their descendants and the Dragons as a whole as the personified Sacred Animal and Pet of Zagreus.

Trivia

 * The Greek word Megaleío, μεγαλείο, means "Splendor". A word that literally means "magnificent and splendid appearance; grandeur".