The Wilds Await
Midgard is a small world within the Mystbound Realms. It is around a thousand miles in diameter and surrounded by Mysts. It has been isolated from any other worlds for at least three centuries, except on the western border, where a Myst-tide has opened irregularly around once every fifty years, for a week or so.
Midgard is dominated by the human Kingdom of Pelias but contains smaller settlements of the all the playable races common to D&D 5e. Magic is particularly weak on Midgard; except in the western marches, close to the Mysts. As a result, magic users are uncommon; and even divine magic is rare. Hence Midgard is much more like a true medieval setting than the default D&D world.