I wonder where the term "boss battle" comes from. We usually apply that term to a strong enemy in a video game, but almost never that enemy is a literal "boss", let's say the CEO of a company, or a director of a movie, or a principal of a school. Was there a game that first used the term "boss" to describe a strong enemy? If so, which game would it be? This is a very interesting topic since we all use that term instinctively, but never have I seen someone question why we call a strong enemy that way.