New Section

'A new section,' I thought excitedly.

They are trying to open a new section, not a new floor. An entire new section, which will have its own floors. 

If they are lucky, this might be a section that might haven't been opened before and that is what they are betting on, seeing the way, they are trying to open the way through it.

They are trying to break the broken formation covering the broken wall. An extremely dangerous thing to do, but those five Sky Sovereigns were powerful and seemed to have taken all the precautions, with powerful artifacts floating around them.

Still, even that wouldn't be enough to protect them, if things really went wrong.

It is the risk, that they are willing to take, and seeing the things found here, I would be too, if I had been in their place.