According to Ajax and the other young cultivators, the demon world was one of a scary world and it was extremely difficult for other beings like humans to enter the demon world.
Even if they could enter, it was impossible to survive in that world as it was not at all suitable for other beings to sustain the large amounts of demonic essence of nature in it.
Moreover, they didn't expect that they were going to train in the demon world. So, they were shocked at Edmond's answer.
"Godfather, how are we going to enter the demon world?" the captain of the Edmond's adopted children asked with a serious face.
"It's thanks to Darbaudr, we are going to enter and how we are entering into the demon world, don't ask me. You will know soon enough," Edmond pointed at Darbaudr, who was meditating in front of the huge boulder and asked them to not to ask about their method of entering the demon world.