The solar eclipse.

He isn't a legend, and not many people know of his power. A demon who was born on the very first solar eclipse, and therefore bound to it, Et obscuratus Solis was a fire demon, but he wasn't a normal demon.
Solis, as he was called, was many demons in one body. He was from a family of demons that practiced cannibalism, and it was the source of their power. The more demons he ate, the stronger he got. But what happens when his sister pays him a visit with a scheme that turns his life upside down, and gets them banished from hell, hunted by demons and angels alike, and it's all because of the upcoming solar eclipse, and a prophecy made millineum ago?