Sorc Merc Help

Got the lightinghose to works, its pretty dam good, but.... my merc gets 1 hit by multi, shes always dying. Shes lvl 88 and uses clean .08 gaze, eth skullders and zeph. even why i put on bugged valor shes dies fast. i duel sorcs and there merc can take some guided shots from zons. any body kno how to boost her up, so shes doing die as much