and recuiting him is completely optional and provides a different ending as for the bosses both have attacks that hit the whole party but if byou can beat one the other shouldnt be too hard especially as Hades uses up turns summoning easy to kill shadows...feel free to use licenses as they will be gone after you win winning will unlock floors 6-15 and beating that will unlock floors 15-30...sadly you have to leave again before doing fllors 16-30