Niv - Fire breath

          Bolas snorted, and spread a clawed hand. Vast coils of death magic unrolled, reaching for Niv-Mizzet, who dove again to avoid them. He spread his jaws wide, and unleashed a stream of fire, dragging it across Bolas and making the ancient dragon raise an arm to shield his face from the flames. Behind him, roofs exploded, and a towering spire became a spurting chimney of fire.

***

The Gathering Storm, Chapter 18