Vol'dan: (Vol'dan is a bird-like, five-headed creature of impressive size. He was first mentioned in the myth of the Looking Glass Inhabitant, who came from the heavens to the Savialista lands to rid the people of a monster.)
Vol'dan burst from the earth, destroying the fertile fields of Savialista and entire settlements with his long neck. They devoured crops and livestock. The more they devoured, the longer their neck grew. One day, Vol'dan wanted to swallow the Sun as well. The clouds held they back for a time, blocking the sky and preventing the monster from clowning around. Until a nameless hero from Through the Looking Glass came to the aid of the people. He struck the monster down with a cane from the shadow world, forcing Vol'dan to retreat. The beast bled shadows like blood, but did not die, returning underground.
So, it is believed that when it's cloudy outside, Vol'dan is trying to reach the star again.
Image 1: An image of Vol'dan, whose central head reaches for the Sun. Image 2: Another analogue of Vol'dan is "Bird of the Fields".
The BUG comforts Vol'dan. Just a different, non-canonical view of this story.