The Last Layer.
Ace, Cherry, Jim, and Anya, the four walking Granian weapons granted the ability to drain and weaponize blood in any creature, were made to scale a mountain as a form of their training exercises. With the reasons given to them, the Mutants quietly scaled the mountain and so far had not experienced any hardships.
While doing so, Ace was shocked with a wonderful surprise by his system that decided to suddenly go off on its own. This was its clever way of wanting him to rely more on his strength than the skills it could provide him. The end result was a young man who went from holding back and cowering a little to a slightly braver, tougher, and more muscular Mutant with ever-glowing red eyes.
At the moment, the Mutants were at the edge of the last layer of the mountain, the snow-covered layer.
The first was a dirt layer, having almost no difficulties climbing and certainly no life to combat or kill.