You have to go to the side-quest in Ancheim, where you visit the Mill (to the left of the Scrolls shop) and eventually come across them. If you had done it before going to Grandship, they would have had 4500 health, but now I'm pretty sure they have 45,000 health. And my favourite job would be the Vampire if I had it, as it has Curaja and Firaja etc., doing tremendous damage/healing.