Destruction to light

A sudden war began, several cultivators from different plane gushed into Green plane, cultivators acted like mad beasts, slaughter happened every where in the plane until It became a wasteland. The war ended and a lot of people were displaced, some elites managed to gather some cultivation arts and created sects that acted as world power. To live a life you have be in of this sects, with small resources and better ways to cultivate, light seems to be shining from the debris of destruction left.