Black holy light shimmered on the Inferno Spear for the first time. That was Rafel using divine spells at full potency, bringing her Divine Might to bear from all those years ago.
The spell originated from the Metal God, of whom Rafel was a favorite angel. It was the Metal God who had allowed her the privilege of learning Divine Might, a rarity among the gods. Rafel was also one of the very few angels capable of using divine spells after the god she served had perished.
Fundamentally, if Rafel had wanted to she could have taken her master's mantle and become the next Metal God.
But the journey would have been arduous, and there was probably no way she would have actually risen to that level. Becoming a human might would have allowed her to advance a lot faster instead.