Why do you think a solar eclipse happens? You really thing that's the moon in the way? You're wrong... IT'S ME

The not as well known counterpart to Leviathan and Behemoth, Ziz is the Lord of the Sky. A mere flap of it's wings could blow a city off the planet. It is equal in size to both of them. However, it only appears at sunset, or in the shadows. The reason why it's not so well known? It leaves no witnesses behinds...

It is described as "Being so big it could block out the sun with its wingspan".