Nadiria is the name of the evil underworld in Dragon Quest IV and V. It is accessible only near the end of each game and contains the final dungeon and boss for each. It has its own world map which is typically much darker (and smaller) than the normal world map. In Dragon Quest VI there is a world similar to Nadiria, called the Dread Realm, except instead of being below the world it is between the real world and world of dreams. Its counterpart is Zenithia, a castle in the sky.