After more than a month of fighting, they were all used to fighting skeletons, the numbers of enemies increased, but women didn't realize it because the fighting was still the same.
That month they went a long way and cleared the first cave and entered the second cave, Zhang Yi realized that this underworld had only hundreds of caves and nothing else, so they had no way to choose and just go ahead.
So if they eliminated all the skeletons this world would be destroyed, of course, the difficulty of this mission is enormous and cannot be easily done. If Zhang Yi didn't have his divine sense technique they would have only stayed in the first cave until he died or all the skeletons were gone.
Even though nobody's cultivation had increased at that time they learned to use their moves well to kill their enemies better using less qi and energy, so everyone gained a lot from it.
