A unique and haunting RPG. One of the rarest and best PS2 games around.
I think the main thing that makes this game harder is the fusions. Not having the right spell in this game can be your down fall, and if you fuse you only monster with a healing spell, you're screwed. I'm used to the fusions because of the Persona franchise. Granted, they aren't exactly the same when it comes to the monsters but the same principle is there.
Even for seasoned vets, I'd recommend you at least look at an online guide if you get stuck or frustrated. This game doesn't have many clues when it comes to what to do next at times. If you take a break from this game, prepare for a lot of wandering until you remember what you have to do next. The pros to this game is the challenge. You can depend on having to look for weakenesses when it comes to bosses. The story line is great. I'm about 20 hrs in. Basically you control the destiny of the world. Your actions will result in the various endings in this game. The graphics aren't anything special but they were good for a early ps2 game. The music is pretty good, all of it is fitting for the game.