The wall appeared ochre, and Zhu Yu scratched it hard with her hand, but only a tiny bit of debris fell off. She pinched the debris between her fingers and then knocked on it a few times with her fist, feeling more certain in her heart.
"It's rammed earth." She walked over to Lu Qing and told him, "In Shuo Land, rammed earth is generally made of lime, river sand, and yellow earth. The hardness after drying, and the texture of the debris, are similar to this.
I've seen people build houses with rammed earth, and I've seen earth kilns built with it, but I've never seen anyone use it to completely seal a room."
Lu Qing listened to Zhu Yu's words, thought for a moment, and seemed to have formed his own judgment.
He said to Rune, "Go find a servant from the Great Priest Mansion and ask who sealed this place up initially."
Rune nodded and walked out quickly.
