Iron Man suddenly chuckled dryly, speaking to himself: "My father participated in the rebirth plan back then, keeping a tube of the most original super serum. I don't know what side effects it has. I've always kept it as a treasured relic from him, dear Guan..." Tony's face instantly darkened, revealing a sinister smile, "For world peace, for enhancing your abilities, I'll have to burden you a little! Thor, hold him tight! I'm going to get started!",A powerful force surged through his body, and a black dragon pattern instantly appeared on Guan Heng's chest. This was the mark of the Divine Dragon's Son, the inheritor of the Iron Fist!,This action was originally a whim. Who would have thought that when the sword touched the flame, it let out a joyful cry, instantly sucking up all the dragon's heart flames!。