Terra Incognita

The "Terra Incognita" is a dimension very close to the earth, level 1. So it's not a world apart like in Game of thrones or the Lord of the Rings. It is a copy of our world, but with the difference that there is magic, creatures and magic spirits. What makes this world remain stagnant in the fantastic medieval era. Please note, it remained at this time until our time, which makes it seem like still in the Middle Ages, but much more developed, for example with very dense cities and gigantic castles. It is possible to travel around the world, on five continents via the teleport portals.