[Illusion]

Originally Posted by Demonskid

I want a mermaid, they look cool x3 -tries to get one to drop-

So the newbie guide mentioned something about Castle of Satan... when does that unlock? =o

I believe it unlocks technical dungeons that is just another optional dungeons to play.

Then when you beat the Castle of Satan of the Abyss (I believe that's the name) in Technical you unlock challenge mode which is playing through all the missions you played before but using only your friend's leaders as your team. And you can easily breeze through the dungeons you already done or finish in the future for easy magic stones. I easily managed to get 40 stones from it when I first unlocked it.