Underlight

Underlight is a city where stolen goods are sold and illegal services are provided. No one knows where it is, the only way to get there is through portals spread across the world. It is invisible form the outside as a magical barrier covers it in an illusion. Underlight has existed for centuries and was created by a group of wizards and witches. Legend say some of them still walk this earth.

Trivia

 * Criminals from all parts of the world come here to do business no matter the creature.
 * The Underlight is adapted for mermaids with magical water tunnels so they can get around.
 * The illusion of what the surroundings look like from the inside changes regularly. Some days it appears to be surrounded by forests, other days by stars and so on.
 * The city and its portal locations is generally unknown to any non-criminals.