Lancelord Gaheel Ja

WHM or PLD (most likely PLD due to extremely high defence)

Casts Cure IV, Protect, Shell Blazing Angon - Fire damage 150-300 AoE damage Granite Skin - Stoneskin effect, cannot be dispelled

Uses Blazing Angon very quickly and repeatedly below 25% hp. Doesn't seem to use the move at all until this point.