Boss fight usually occurring after a major revelation in the plot (e.g., about 2/3 into the game). Usually notable for being a long and difficult battle... that is, if it isn't a Hopeless Boss Fight. In a game which has only one battle music for normal battles and one for most bosses, a climax boss may have its own unique battle music, a distinction otherwise reserved for a Final Boss. Contrast Anticlimax Boss, That One Boss, Final Boss. Inversion is The Unfought, where this kind of battle is set up, but never happens. It isn't usually required to beat him in Orgasmic Combat.