Since they couldn't break through the formation in a short time, they decided to crudely drill an escape tunnel instead.
It must be said that the artifact refining technique of the expert who built this palace far exceeded everyone's imagination.
A mere wall of Blue Steel Rock was actually even harder than ten-thousand-year-old Xuan Iron!
Fortunately, the wall was already full of cracks, which gave Zhao Sheng and the others hope of breaking through it.
Clang!
Zhao Sheng casually dropped a broken Spiritual Flying Sword, then skillfully reached around his waist with his right hand, producing another Flying Knife that shimmered with a cold, golden light.
The Flying Knife instantly grew to three feet in length, and Zhao Sheng used it as a chisel, fiercely targeting a dented part of the wall.
Bang bang!
...
Another hour later, the vacuum suction inside the great hall had reached a terrifying intensity.
