Originally Posted by DragonHeart
Well, the Gil Snapper is actually an elite mark, I had a lot of trouble with it too, namely at the end when it starts spamming Blizzaga. -_- I defeated it at level 40 lol. I'm sure it's possible and likely to kill earlier, but I just couldn't get that last 5% of its HP down until then. If you have Ice Shields for your close range melee that helps a lot. Other than that, you can try sticking Silence or Immobilize on it when it gets to that point, it never worked for me but I've never been much of a magic user beyond cures so I only tried once or twice.
~DragonHeart~