From the introduction:
The Kingdom is a haven of peace and prosperity, but it is regularly threatened by the Chimera, a deity of the night who brings dissension, doubt, fear and hatred into the hearts of inhabitants.
If ever the Chimera took over, the Sun would go out. It would be the end of the Kingdom.
To counter the Chimera, the solar deities created the Forge, an organization of the greatest minds of the Kingdom - scientists, artists, magicians and priestesses.