Yeesh, unfair trial indeed, much higher rank boss opponent, gradual increase of enemy's power levels, gradual use of it's true power later in the fight and a berserk phase if brought to low enough health? Who designed this Dream Dungeon trial? Even Drake's Yggdrasil Dream Dungeon didn't seem this lopsided in difficulty with the win requirements, it at least tried to give you a means to succeed with the different boss rewards countering the subsequent bosses to an extent.