Everyone knows of the 12 Zodiac Signs. But- no one knew that they actually existed. They were created as a guide for humans. Each having their own roles- they had lived peacefully with humans for more than a few centuries.
Until- some had started to become wayward. The Signs that were meant to be guiding the humans now prey on them.
The humans needed someone to save them- someone who can fight against the monsters that lurked in the dark. And so, a last group was created.
A new race has been given birth: the 13th Sign that no human knows of, yet- they are the only thing that stands between the destruction of the world as everyone knows it. They are the Pyxis; known as the Compass: The guide for those who grew astray from their path.