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!",This day, Daniel and Guan Heng walked out of the room of spirit and time. In reality, it had only been a day of twenty-four hours outside!,Daniel shook his head. "Everyone faces different opponents. The unique feature of this cave is that it magnifies the shadows within your heart. If you don't want to be consumed by your inner darkness, defeat it! That's all I have to say!"。