Its name rhymes with Sebastian

Story: "Emia: eclipse of light and shadows"

Created as the guardian of the continent the story takes place on by the gods who had finished creating the world and wished to rest and watch the world they had created. Eclipstian was given too much power by the gods and begged them to aid it in removing some of its power. The gods ignored it. Eclipstian was able to oversee its duties but it's great power eventually drove it mad. Its rampages brought bout great destruction, no one was able to stop it. Then two powerful Emian appeared, the dragons Solarian and Lunarian worked together to seal Eclipstian away. It was thankful for the two dragons, for it could now rest in peace knowing it was no longer causing harm to the creatures it loved.

Although now in the current era, something is attempting to weaken its seal.

Known as the Eclipse Dragon in the world's myth/legends.