They arent that strong at first, first few lvls they suck ass, dont really do good, so your going to have to put yourself to some use(aka healing), then later on you can group buff your party members with Aerial Armour(Blinkaga), and Ice spike-aga and Enthunderaga, and stoneskinaga. Then at lvl 70(65 for Fenrir), THEN they gain a super powerful attk, good for HNM and BCNMs only however.