When a rift opens between planes, an incredible amount of energy and heat is released, influenced by both the planes it connects and the instability of the crossing. The most dangerous of these rifts bridge the Material Plane and the Feywild and are prone to sudden, violent collapse, often leveling the surrounding area on both sides. For Cazn dragons, however, this is the perfect nesting ground; so much so that there is fierce competition to hold territories surrounding these breaches of the planar weave. it's rumored, even, that ancient Cazn dragons will tear open their own massive rifts, but this phenomenon has never been observed.