The Fright Side is a realm where all magical creatures live. This is the home of Scary Godmother.
It has been revealed that there are 2 ways into the Fright Side. One through a cloud in the sky on a broom, and the other through the magical key that Scary Godmother gave to Hannah which when placed into any lock creates a portal to the fright side.
Magical Halloween Spirit
The Fright Side is powered and exists because of Halloween Spirit shown inside everyone. When there is no spirit the fright side will start to fall apart and disappear. It reappears when there is Halloween spirit.