How Many Bosses Are There in Phantom Blade Zero?

Phantom Blade Zero has a large number of boss fights, most of which are tied to the main story. The game also has several optional bosses, but players are encouraged to defeat them, as some are tied to the Perfect Ending. The game also has a system where, if you die during the second or third phase of a boss fight, you will respawn at the beginning of that same phase, making these encounters more manageable.