The reason she came back to challenge the Thunder God was actually because she had been in such terrible condition back then. She gained no advantage in their fight and almost perished. Of course, she wasn't using the identity of Kong Xuan at the time.
After listening, Nezha pulled out a small fire stick he had obtained from Chao Feng out of his sleeve. He'd studied it a bit and concluded it seemed related to the Phoenix Clan, though he wasn't sure exactly how.
As soon as Kong Xuan saw it, her eyes were glued to the object.
"You recognize this?"
Kong Xuan fiddled with the small fire stick in her hand, speaking with a trace of sentimentality, "This is the staff body of my Phoenix Clan's supreme treasure, the Phoenix Staff. This treasure can only be wielded by someone with Phoenix Clan bloodline. In anyone else's hands, it's just a slightly tougher stick."
Nezha nodded in understanding, waved his hand, and said, "Then just keep it. I don't lack sticks to use anyway."