"Don't eat it. It's harmful to your body." Feng Qingtian touched her head.
Gu Bailu could only nod. She had wanted to trick Xiao Jingyun and the others, but it seemed that she had no choice.
"But it doesn't matter. I have an invisibility rune that'll prevent them from seeing me."
Feng Qingtian nodded and looked carefully around the corner. There was still nothing in the palace except for the guards who were patrolling the place.
The door was tightly shut. Not only did they have to avoid the guards, they also had to jump up and press a spot to open the door.
"How many invisibility runes are there?" asked Feng Qingtian.
Gu Bailu counted. "Ten. Drawing this thing consumes too much spiritual power. I don't dare draw too many."
"Let's wait for now. If it doesn't work out, we can use this to go in."
It was already dark when they entered the underground palace. They had to find out what was going on.