Evan Coming 12/17 tomorrow // and .... more Q/A

Optional bosses sometimes have their own stories (uh... anyone played Dragon Quest 8? There's a bunch of dragons you can beat after you beat the game that have a little bit of story. Probably not the best example because PART of this is necessary for the good ending but a bunch of the dragon challenges aren't.) but again, it's not necessary for the main story. Some games just like to raise the appeal of the extra bosses by bringing them to life with a tale.