Orcs are a demi-human species that live in the unexplored region of the Abelion Hills. They are tribal and in constant warfare with the other demi-human tribes in the area. The fighting was so bad to the point that the Holy Kingdom had to build the Great Wall in response to their conflicts.
Reasonably so, the Holy Kingdom built the wall with the sole purpose as to keep the fighting between demi-human tribes away from affecting their nation in any harm's ways possible. One could even speculate that the Holy Kingdom didn't want to be caught in the crossfire with them was the reason for why they built the wall in the first place.
Orcs are demi-humans around the height of a typical man, with porcine features. Orcs also tend to resemble apes, but have barely any body hair. They're far taller than humans and some are even ten feet in height.
It is said that Orcs are a species that loved cleanliness. Their sense of beauty was different from humans, with human beauties being the pinnacle of ugliness.
Orcs have great physical strength, greater than what a normal human could possess. However, orcs have rather low intelligence in contrast to their brute power.