I killed it at level 36 without any problems. Did you try having drain and Raise gambits on all 3 active characters ? Try a combo of gambits like this:
1)Ally HP<10% / Phoenix Down (or Raise)
2)Foe: Character's MP < 30% / Syphon (not really needed but nice to have)
3)Foe: Party leader's target / Drain
3 people "draining" a fiend can pack a wallop. Try it on any foe that isn't undead, you will be glad you did![]()