"It seems that the materials used in the building every two floors of this so-called 'Ye' building will change. This black stone is probably several times stronger than the hardest alloy available on the earth, and it has an absorption effect on sound waves and light waves in different wavelengths. ”

Zhang Chen's heart at this moment was already full of anticipation and curiosity about the fifth layer.

When the longer black corridor reached the end, the waiter was still standing in the doorway.

"Two people, the fifth floor is not the same as the first four floors. All quests are not available on a single quest release, as quests that can be assessed as Tier 5 difficulty are enough to threaten a province, which is very rare, and therefore the number of quests is very rare. At most, there won't be a single new mission for half a year. ”