Forgive the spoiler, but when Duff gets stabbed, that guy gets stabbed DEEP. That spike must've at least doubled in length if it could go from Duff's gut to about four inches through his back.
That final boss is INSANE. It has 200,000 health, 666 power. Even with everything maxed, it'll take out even arc angels and dragons in just a few shots, and just annihilate everything else. Even with a maxed barrier, maxed castle health, a constant wave of maxed dragons and angels, and a never ending rain of maxed out arrows of all types, plus the occasional maxed special when I can get it, this guy still managed to kill me with about 8,000 health to spare. How the hell are you supposed to beat this thing?!