Damn Rogue Legacy

Well, I just spent three hours on Rogue Legacy in the blink of an eye. I was frustrated for a good while with the game but tonight I finally got a run that earned me over ten thousand gold and that seemed to push me over the hump. Now I'm unlocking something every run again and have collected all of the runes. My characters are level 101 and although I cannot yet take on the boss of the... What is the word they use for the attic part of the castle? The fireball boss. I can't beat it, but I can make it that far, so it shouldn't be much longer.