I've ranted about this boss many times, so I'll just quote one of my previous ones. There are probably others that have been more frustrating, but this was the first one I ever versed that gave me serious issues.
RedDeadFred said:The Marionette from Shining Force. It took me a lot of tries to beat this guy. He probably handed me more defeats than anything else in the rest of the game combined.
He has Freeze level 3! This would be okay if we were in say... Act 6-7 of the game but no, we're at the beginning of Act 2. Freeze 3 has a longer range than anything you've encountered thus far and is powerful enough to one-shot a lot of your party members. It can also hit up to 5 party members at once (that should never happen though unless you clump your troops up a lot).
He also has crazy high agility for that point in the game so he's going to dodge probably 25% of the attacks you throw at him. The icing on the horrifyingly deadly cake is that he regenerates HP every turn. This is normal for bosses later in the game, but this is the first time you encounter it.
The only thing that makes this fight manageable is that his minions aren't too strong and if your characters are decently leveled, you should be able to surround him and pummel him (as long as you don't get too many of your attacks dodged or have him blow up too many of your people too early in the fight).
Anyway, I don't have problems with the guy anymore (I've played through the game 8 or 9 times), but on my first playthrough.... I retried the battle so many times over several days that he started showing up in my dreams. I was literally dreaming that I had defeated him only to wake up and be disappointed. Didn't help that he looks kind of terrifying.