Orc Camp was a hunting ground which encompassed a wide circular area. Inside, many orc camps could be seen with several [Orc's Patrol] patrolling between each camps. There were three size of the camps, small, medium, and large. Each of the camps would have some sort of leader that running the camps.
The small camps was scattered around the edge of the area. When one went deeper into the region, the camps would get bigger and bigger until finally they arrived at the one and only large orc camps in land.
The leader in the small camps was a monster that was slightly stronger than the rest of the orc in the camp but it could not be considered as a boss which was why people considered it as a mini boss.
Meanwhile, when one arrived at the medium size camps, the leader inside it was considered a genuine boss. It was much stronger that the monster in the area. The boss had a uncommon grade.