"Why won't we?" William didn't care about any fog. In fact, he grew curious about this phenomenon, "let's go and check it. If it's really dangerous, we will retreat."
"Got it," everyone said, and William then took them towards that place.
Crossing this distance took them roughly six days. During which, they met many monsters, all were weak, all faced the same fate under the team's overwhelming strength.
What they noticed was that the closer they got to that place, the fewer teams they met.
"We are here," William and his team didn't listen to any warnings from those who they met. They trusted William, and the latter trusted his knowledge.
Even if it was dangerous, he'd better see what it was. This place wasn't that far from the borders of the Scorching Lands. And as such, he wanted to see what kind of threat this place really held.