I beat it in a party of four also. I was a whm, and I was accompanied by a paladin and two monks. The two monks opened with 100 fists, and the paladin used invincible. It was a good thing he did too, as he was petrified within 10 seconds of battle. The two monks with 100 fists were able to defeat the eye and get the dragon nearly dead before the paladin lost hate from invincible. I only casted curaga twice and the battle was over. That was a very cool battle - cutscene and all. I want more battles like that. It's a shame I had to wait till 25 to finally fight a boss battle. At this rate, I'll not see another boss till level 50.