As long as they hid inside when danger struck, the effect would be comparable to taking refuge in an underground fortress. However, there was a prerequisite. They had to actually get inside before they could even think about its future Usage. If they were locked out, all this talk was useless. Realizing this, Li Hu paused for a moment before nodding in agreement.
Having received permission, Liu Cheng returned to the front of the gate and directed the other three to take out various bottles and jars from their crates. Since the four of them hadn't had much opportunity to utilize their skills lately, they had spent their free time mixing these various solutions. There were red, green, blue, and purple liquids. As several different colors were poured into a single bottle, Liu Cheng shook it vigorously. An ink-like blackness swirled out from the center, quickly permeating the entire mixture.
"It's done!"
