“ In the middle of the sky over the land of Dankij there is a door. The door is fixed in an upright position and appears to be fastened to the very sky itself. Worldwide rumors say it has been there since The Creation. What could be behind this door?”
“ If you want to add a 'supernatural' touch to your campaign, define the rules of magic and the universe. Make your players comfortable with those rules. Then your new supernatural creatures must then break those rules.”