[Squall Lionheart]

Your own level doesn't matter,
- Cast Float on both of them so they can't heal themselves
- Junction your Elem-Atk to Air elemental magic like Tornado or Aero... If you don't have Earth elemental magic then junction Poison Elemental magic, preferably in the following priority:
1- Quake
2- Bio
3- Aero
- Juction your Elem-Def to Earth elemetal magic like Quake
- You can draw and cast Protect from the Brothers
- Junction an effective Stat-Atk that is more likely to inflict tough enemies