Every opinion counts here FFGuy 

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Haha, yeah, that boss is crazyWhat about the Demon Wall in the Castle? :stare:
XD, j/k
It just has nine floors, plus two thrones and a new special area. There are other secret areas like the tower who aren't necessary to complete the castle but I bet that curiosity won't let you pass that area without looking
Just get the Gemstone from the Stone Demon, and the Key to the lake from the Keeper of the Keys who is in the Catacombs. Use the Gemstone on the NPC in the lake and then you'll have access to the Hidden Area.
In there you'll find a NPC who is holding, well, who has a shield like emblem. Take the emblem and reach Floor 9, then use it on the Door NPC that is located in there.
After that you'll reach the throne room in which you'll fight a boss. Defeat the boss and you'll reach another area in which you'll fight another boss. After that, a NPC will ....won't spoil.....but you'll have to decide between good and evil.
Also do you remember the dark crystals? There's a NPC in the Throne Room that will activate a trigger if you have six of them.
well, I think that's all...