Throughout the year, the grand mountain range in the West of Stahl was covered by a glistening layer of snow, creating a desolate and almost ethereal landscape, resembling the sacred resting place of a forgotten ice deity. The rugged mountains snaked along the western coast and entered the treacherous Frozen Forest, losing itself into the immensity of that dangerous place.
Fortunately, an invisible barrier seemed to bind the unknown dangers in the forest, preventing them from using the mountains as a path to attack Stahl or from decimating the normal animals that inhabited the mountains. However, every ten years, this barrier was mysteriously weakened, which allowed the monsters to invade Stahl and wreak havoc on the lands. Thankfully, the barrier still held those dangerous group of monsters, such as Winter Orcs and Death Spiders, allowing only weaker packs of beasts to pass through the invisible line that separated the border of Stahl and the forest.
So, I had decided to explain a few things here on this chapter and throw a new problem on the MC's lap, a problem that he will have to be decisive and that maybe will change a few things in his life.
I hope Henry is prepared for the unforeseen events ahead.
PS: When everything is solved, the storyline will be back to explain more things, such as Mana Circuits and other things that you have been asking.