Sayonara Barbatos. May your BURUAAAAAAAAAAAA never die and be forgotten.
Once he has lost half of his HP, he will start countering the chanting of characters with his Air Pressure or Negative Gate.
But you can abuse his countering for your own use.
Your character should chant a spell and after you see that Barbatos is ready to cast a spell, cancel your spell and run away. However, it is quite hard to master this technique. I still have problems to cancel it at the right moment to avoid getting hit by his spell.
But even if you get hit, your casters will probably have enough time to cast their spells.
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