Astarte

Astarte (アスターテ) is a legendary dragon who was one of the Four Dragon Emperors. He's known universally as the Earth Dragon Emperor and the de-facto leader of the Draconic Order. Alongside Ascalon, were the only two Dragon Emperors alive by the time Acnologia's arrival.

Magic & Abilities
Earth Dragon Slayer Magic (大地の滅竜魔法): As the Dragon Emperor presiding over the, Astarte is the dragon who possess this magic and capable of ultiziling it to his ever earthly will. He once had a disciple who learnt this particular magic. He's capable of manipulating the earth and even release a roar filled with early elements and rock.