What Yi Yun was referring to was obviously the God Advent Tower. It was one of his trump cards in his expedition to the Azure Wood Great World. It had immense defenses, but its power reserves were expendable. Once it was drained, it needed a long time to recharge time, basically rendering it useless in the near future.
Furthermore, the God Advent Tower was a supreme artifact at the Divine Lord level, one that Yi Yun did not want to reveal freely. This was his first encounter with Yue Yingsha, so he did not know her identity or background. He obviously was reluctant for her to enter the God Advent Tower, but what Yue Yingsha said before had moved Yi Yun.
"Enchanted artifact?"
Yue Yingsha faltered for a moment. At that moment, a tiny pagoda flew out of Yi Yun's body and spun mid-air before expanding in size.
"Don't resist it."
After Yi Yun said that, his body flashed and disappeared into the God Advent Tower.
