Seeing how I absolutely despise N and his entire character (pretentious/attempts to convince you he's learned a lesson at the end of battle/didn't believe him/all the crap he put me through/still hate him.) the castle, to me, was none to exciting. I thought the fact that it ominously loomed over the league was pretty cool, but other then that, the only room I bothered to look into was N childhood room, which was indeed unsettling... The only thing that castle is to me, is a testament to the thing that f**ked up my chances of becoming a Champion on my first League Run because Ghetsis and N had to be idiots.
Suffice it to say that I'm pretty bitter about not becoming a champion on my first run... :/
This castle is nothing but a painful monument to what could of been.