Agartha is a region nearby the forest kingdom. It once had a great city but unfortunately it was often targeted by creatures. Agartha was a very isolated region, and only the descendants of the founders were allowed to live there.
In the city, the population was rather low and more and more creatures started to attack the region, so all of the mightiest orc mages of the region came together and created the Colossuses. However, after many centuries most of the Colossuses started to fall and the region fell with them. Today, all that is left are Ruins and the remains of the titans in the so-called "Titan Graveyard". This is the border with the land of fire as it is so dry. The colosusses built here are made out of metal like the legendary Talos and others, which have been destroyed. Talos has now become the guardian of the Forest Kingdom.