Deep within the canyons of Crevakus in Blyzrynthine, huge fiery rifts tear through the ground. These Thermarifts are caused by the fire leyline running beneath the canyonlands, creating massive fissures that belch flame and superheated air. The ground far below in the canyon depths is covered with these fiery tears in the earth, making the deep canyons effectively impassable without magical protection from heat and flame.