Hello all, long-time lurker (around a year), first-time poster. What a fitting first post, on the first time you play the game!
There are a few bosses that stand out in my mind.
- The first battle with Magus actually didn't take me *too* long. It was tricky, yes, but not that bad compared to others.
- Fighting Azala and Black Tyrano took a while because I thought that I was supposed to take out Black Tyrano before Azala. Once I figured out that it's a lot easier to take out Azala first, it wasn't that bad.
- The boss under the desert in the optional quest was quite hard too. He took a while.
-Son of Sun would have been hard, except one of my characters (Frog I believe) was wearing fire-absorbing armour, so I just let the other two perish while Frog took on Son of Sun alone. Piece of Cake.
-Mother Brain... By FAR the hardest the first time I tried. Still is the hardest too (for me at least). It's probably because my normal strategy is so destructive when fighting Mother Brain, as I tend to heal a bunch, which means that I wasn't doing damage to her fast enough. The whole damage increasing every time took me a bit to get used to.
-Lavos form three wasn't exactly hard, but he took me a while. You see, for some reason it took me forever to figure out that I needed to attack Lavos Core to beat him. I don't know why it took me so long. Regardless, that error just cost me a few ethers.
So, in conclusion, Mother Brain was by far the hardest for me the first time around, and still is. Then again, I've never fought Magus the second time (as I always have him join me), so I can't say about that.