Arad kept trying to consume the star from the inside as it collapsed back on him. As long as he didn't allow the pressure to build up too much inside the core, it shouldn't explode into a supernova, but that was easier said than done. Each time his elemental expansion shattered, he was faced with the sheer pressure, power, and heat of the dying star, which far outclassed any attack that he had ever endured.
He did have powerful regeneration, but it was by no means enough to keep him alive. His entire draconic body, which was hundreds of meters long, would get crushed into a tiny ball in a second, burned to ash, and then erased from existence by the boiling plasma. But he didn't die; it took time for his soul to leave his destroyed body, and that time was enough for one more cast.
[Elemental Expansion: Devouring Void]
