The crack in the sky, it would seem, hasn't finished. IT extends outwards in all dimensions. In some spaces, it even extends to the ground in the city like permanent black bolts of lightning. Whatever it is, the cracks are spreading.
Make a reflex save to avoid making contact with the cracks as you fly.
As far as the phenomenon itself, you have never heard of the sky cracking in such a way before and can't determine any obvious cause or cure to the problem. What you do know is that physics typically only behaves in odd ways where one of three things are concerned: precocious (or insane) casters, violent planar bleeding, or the unknowable space between and beyond all things.