The War for the Moon
As the sun set below the horizon, the enormous beast Alklha flew across the sky searching for a new treat. He was tired of trying to consume the sun, which scorched the inside of his mouth whenever he did so. Instead, Alklha hoped to feast on a different treat, not something so hot and enormous like the sun, but also not something too dim and miniscule like the stars.
Fortunately for Alklha, he didn't have to look for long. Soon, a pleasant sphere of light rose over the east, whose light casted gentle rays that mesmerized Alklha. Alklha flew up to the moon and took a bite off of it. It is the perfect balance between the sun and the moon, making it just the right feast. Over the course of the next several months, Alklha ate away at the moon until there is nothing left.
The night after, vampires emerged from their slumbers in search of fresh human blood. However, without the moon light, the vampires' powers greatly diminished, and they could not see in the dark. The vampires tried negotiating with Alklha to no avail. Of course, the vampires could still turn into enormous bats, but mere bats could not hope to beat the might of Alklha.
Thus, the vampires sought the aid of the werewolves, who had been hollering and panicking ever since the full moon started to diminish. In their bat forms, the vampires snatched the werewolves by their shoulders, flew high in the sky, and threw them at Alklha, where the werewolves tore into the giant beast and forced him to regurgitate the moon. The battle lasted for several months.
Finally, the moon was back to the sky. Still, legend said that Alklha, bittered about the loss of his meal, would return on the days of the full moon to try and devour it. On those days, humans should take heed not to look at the sky, as they might witness something so terrifying and incomprehensible, that their minds would snap and descend into insanity.