C673 The Mountain Castle Dungeon Mode Activated!(2)

"What is that black substance? It looks like oil!" Youngest pointed at the city wall. The remaining black oil on the stairs was still burning, and it spread out until it completely disappeared!

"This thing is really powerful. It will be even more powerful if it sticks to you. Even if the two of us are not burned to death, we will be seriously injured! He is really generous! No