The area outside the dragon lines are Wyld zones. During the First Age the Solars expanded Creation into these areas. They used jade obelisks to extend the reality making energies of the Elemental Poles, even creating new networks of dragon lines to stabilise the new land. The Primordials, although greater beings were never so concerned with Creation, they created it as a shield against the Wyld and never lived in it for a long time.
   Exalted is a very explicit game where it fits that things are explained. Warhammer is far more implicit where things are hinted at and mentioned but rarely explained. And yet there's so much they don't explain like what dragon lines are.

   Dragon lines mark the border of an Elemental Pole's zone of influence. The Earth Circle runs through all four of the other Elemental Poles. The Principle Dragon Lines of each other Elemental Pole runs through the Pole of Earth. They also create overlapping zones between eachother and with the Pole of Earth at the centre. Each Pole has an Inner Sanctum outside the areas overlapped by other Elemental Poles. In this areas the energy of the Pole is predominant. The overlapping fields of Essence form an impenetrable barrier against the Fair Folk.