Monsters are placed in the world in certain contexts to give them personality when you first encounter them. So, coming upon a hill giant camp, you may see them sleeping, guarding an object, patrolling or some other action that fits into the quest. Many of our quests involve preventing the monsters from some kind of agenda of their own. They may be on a mission to destroy an object that you have been asked to protect or they may be guarding one of your objectives. "