The story begins in a changeling hive, populated with several tens of thousands of changelings and, most importantly, their Queen, named Chrysalis.
Queen Chrysalis is a rather odd-looking changeling, taller than the other changelings, but that's normal, since she's one-of-a-kind. She might be the almighty Changeling Queen, but she has her downsides too: due to a curse cast by Star Swirl the Bearded thousands of years ago, she now becomes rather strange from time to time.
She doesn't know how or when it happens, but one of her royal guards knows exactly what is going on. His name is Silver Fang, but to the hive he is known as #21. his name comes from the fact that he has a silver fang, No one knows why exactly he does, but they don't seem to be interested in finding out why for themselves. Besides, why he knows what goes on during that time is because she takes him everywhere she goes. He is still unsure why she chooses him every time that strange acting occurs, but there has to be a reason for it. He is loyal to her majesty, and doesn't want to let her down, so he goes along her side. Of course, it is also a privilege to be chosen by the Queen as her royal escort. But it comes out that escorting her during that time is more like foalsitting.
What a beautiful night it is, the changeling thought to himself, while slightly turning towards the moon. And what a beautiful blue moon.
"Oh... the moon is blue," he surprisingly said. He stood up and went inside the hive "That may only mean that tomorrow is the time."
It was quiet as he roamed around the hive gathering important things for his journey with the Queen. Tomorrow was the day after a blue moon, and after every blue moon the Queen starts acting strangely.
Some time passed, and the changeling was still gathering things for the travel. Where were they traveling he didn't know, but he was sure that they were going to travel somewhere, like they always do when it happens. Silver started feeling very tired, but he had to prepare well because anything can happen while they travel through Equestria. At this time, he was dragging a huge cart filled with various items and, as expected, after hours of gathering, he finally felt weak.
"I have to stay awake," he mumbled to himself as his eyes started closing.
"I just need to get the fang paste..." he said as he fell on the ground.
"I guess I can take a five minute break..." he said quietly as he yawned and closed his eyes.