I feel that there should be some kind of reward for finding all of the 61 Dead Ghosts in this game. I just finished about an hour ago, and was slightly disappointed to find that I got nothing for going through all 4 worlds and 3 different story missions to collect all of the Ghosts. Yeah, I got a few hundred Grimoire Score, which does nothing for me, and I unlocked quite a few Grimoire Cards, which I'll never read, but, I mean, why not unlock some kind of Special Ghost Shell? Like, the Awakener's Shell or something like that. I don't know, just seems like a good idea to be awarded a Ghost Shell after waking up 61 Ghosts across the game.